diff --git a/runtime/doc/os_os2.txt b/runtime/doc/os_os2.txt
index 231d7d1..53bb799 100644
--- a/runtime/doc/os_os2.txt
+++ b/runtime/doc/os_os2.txt
@@ -1,221 +1,13 @@
-*os_os2.txt*    For Vim version 7.4.  Last change: 2007 Apr 22
+*os_os2.txt*    For Vim version 7.4.  Last change: 2015 Dec 31
 
 
 		  VIM REFERENCE MANUAL    by Paul Slootman
 
 
 							*os2* *OS2* *OS/2*
-This file contains the particularities for the OS/2 version of Vim.
+This file used to contain the particularities for the OS/2 version of Vim.
 
-At present there is no native PM version of the GUI version of Vim: The OS/2
-version is a console application.  However, there is now a Win32s-compatible
-GUI version, which should be usable by owners of Warp 4 (which supports
-Win32s) in a Win-OS/2 session.  The notes in this file refer to the native
-console version.
+The OS/2 support was removed in patch 7.4.1008.
 
 
-NOTE
-
-This OS/2 port works well for me and a couple of other OS/2 users; however,
-since I haven't had much feedback, that either means no (OS/2-specific) bugs
-exist (besides the ones mentioned below), or no one has yet created a
-situation in which any bugs are apparent.  File I/O in Dos and Unix mode,
-binary mode, and FAT handling all seem to work well, which would seem to be
-the most likely places for trouble.
-
-A known problem is that files opened by Vim are inherited by other programs
-that are started via a shell escape from within Vim.  This specifically means
-that Vim won't be able to remove the swap file(s) associated with buffers open
-at the time the other program was started, until the other program is stopped.
-At that time, the swap file may be removed, but if Vim could not do that the
-first time, it won't be removed at all.  You'll get warnings that some other
-Vim session may be editing the file when you start Vim up again on that file.
-This can be reproduced with ":!start epm".  Now quit Vim, and start Vim again
-with the file that was in the buffer at the time epm was started.  I'm working
-on this!
-
-A second problem is that Vim doesn't understand the situation when using it
-when accessing the OS/2 system via the network, e.g. using telnet from a Unix
-system, and then starting Vim.  The problem seems to be that OS/2 =sometimes=
-recognizes function / cursor keys, and tries to convert those to the
-corresponding OS/2 codes generated by the "normal" PC keyboard.  I've been
-testing a workaround (mapping the OS/2 codes to the correct functions), but so
-far I can't say anything conclusive (this is on Warp 3, by the way).  In the
-meantime any help will be appreciated.
-
-
-PREREQUISITES
-
-To run Vim, you need the emx runtime environment (at least rev. 0.9b).  This
-is generally available as (ask Archie about it):
-
-    emxrt.zip     emx runtime package
-
-I've included a copy of emx.dll, which should be copied to one of the
-directories listed in your LIBPATH.  Emx is GPL'ed, but the emx.dll library is
-not (read COPYING.EMX to find out what that means to you).
-
-This emx.dll is from the emxfix04.zip package, which unfortunately has a bug,
-eh, I mean a POSIX feature, in select().  Versions of Vim before 3.27 will
-appear to hang when starting (actually, while processing vimrc).  Hit <Enter> a
-couple of times until Vim starts working if this happens.  Next, get an up to
-date version of Vim!
-
-
-HELP AND VIMRC FILE
-
-If you unpack the archive that Vim came in and run Vim directly from where it
-was unpacked, Vim should be able to find the runtime files and your .vimrc
-without any settings.
-
-If you put the runtime files separately from the binary, the VIM environment
-variable is used to find the location of the help files and the system .vimrc.
-Place an entry such as this in CONFIG.SYS: >
-
-  SET VIM=c:/local/lib/vim
-
-Put your .vimrc and your other Vim files in this directory.  Copy the runtime
-directory to this directory.  Each version of Vim has its own runtime
-directory.  It will be called something like "c:/local/lib/vim/vim54".  Thus
-you get a tree of Vim files like this:
-	c:/local/lib/vim/.vimrc
-	c:/local/lib/vim/vim54/filetype.vim
-	c:/local/lib/vim/vim54/doc/help.txt
-	etc.
-
-Note: .vimrc may also be called _vimrc to accommodate those who have chosen to
-install OS/2 on a FAT file system.  Vim first tries to find .vimrc and if that
-fails, looks for _vimrc in the same place.  The existence of a .vimrc or
-_vimrc file influences the 'compatible' options, which can have unexpected side
-effects.  See |'compatible'|.
-
-If you're using network drives with OS/2, then you can install Vim on a
-network drive (including .vimrc; this is then called the "system" vimrc file),
-and then use a personal copy of .vimrc (the "user" vimrc file).  This should be
-located in a directory indicated by the HOME environment variable.
-
-
-ENVIRONMENT VARIABLES IN FILE NAMES
-
-This HOME environment variable is also used when using ~ in file names, so
-":e ~/textfile" will edit the file "textfile" in the directory referred to by
-HOME.  Additionally you can use other environment variables in file names, as
-in ":n $SRC/*.c".
-
-The HOME environment variable is also used to locate the .viminfo file
-(see |viminfo-file|).  There is no support yet for .viminfo on FAT file
-systems yet, sorry.  You could try the -i startup flag (as in "vim -i
-$HOME/_viminfo") however.
-
-If the HOME environment variable is not set, the value "C:/" is used as a
-default.
-
-
-BACKSLASHES
-
-Using slashes ('/') and backslashes ('\') can be a bit of a problem (see
-|dos-backslash| for more explanation), but in almost all cases Vim does "The
-Right Thing".  Vim itself uses backslashes in file names, but will happily
-accept forward slashes if they are entered (in fact, sometimes that works
-better!).
-
-
-TEMP FILES
-
-Temporary files (for filtering) are put in the first directory in the next
-list that exists and where a file can be created:
-	$TMP
-	$TEMP
-	C:\TMP
-	C:\TEMP
-	current directory
-
-
-TERMINAL SETTING
-
-							*os2ansi*
-Use "os2ansi" as the TERM environment variable (or don't set it at all, as the
-default is the correct value).  You can set term to os2ansi in the .vimrc, in
-case you need TERM to be a different value for other applications.  The
-problem is that OS/2 ANSI emulation is quite limited (it doesn't have insert /
-delete line, for example).
-
-If you want to use a different value for TERM (because of other programs, for
-example), make sure that the termcap entry for that TERM value has the
-appropriate key mappings.  The termcap.dat distributed with emx does not always
-have them.  Here are some suitable values to add to the termcap entry of your
-choice; these allow the cursor keys and the named function keys (such as
-pagedown) to work.
-
-	:ku=\316H:kd=\316P:kl=\316K:kr=\316M:%i=\316t:#4=\316s:\
-	:kD=\316S:kI=\316R:kN=\316Q:kP=\316I:kh=\316G:@7=\316O:\
-	:k1=\316;:k2=\316<:k3=\316=:k4=\316>:k5=\316?:k6=\316@:\
-	:k7=\316A:k8=\316B:k9=\316C:k;=\316D:
-
-
-Paul Slootman
-
-
-43 LINE WINDOW
-
-A suggestion from Steven Tryon, on how to run Vim in a bigger window:
-
-When I call Vim from an OS/2 WPS application such as PMMail it comes up
-in the default 25-line mode.  To get a more useful window size I make
-my external editor "vimbig.cmd" which in turn calls "vimbig2.cmd".
-Brute force and awkwardness, perhaps, but it works.
-
-vimbig.cmd: >
-   @echo off
-   start "Vi Improved" /f vimbig2.cmd %1 %2 %3 %4
-
-vimbig2.cmd: >
-   @echo off
-   mode 80,43
-   vim.exe %1 %2 %3 %4
-   exit
-<
-
-CLIPBOARD ACCESS (provided by Alexander Wagner)
-
-Vim for OS/2 has no direct access to the system clipboard.  To enable access
-anyway you need an additional tool which gives you access to the clipboard
-from within a vio application.  The freeware package clipbrd.zip by Stefan
-Gruendel can be used for this purpose.  You might download the package
-including precompiled binaries and all sources from:
-	http://www.os2site.com/sw/util/clipboard/index.html
-	http://download.uni-hd.de/ftp/pub/os2/pmtools/
-
-Installation of this package is straight forward: just put the two executables
-that come with this package into a directory within your PATH for Vim should
-be able to call them from whatever directory you are working.
-
-To copy text from the clipboard to your Vim session you can use the :r
-command.  Simply call clipbrd.exe from within Vim in the following way: >
-
-	:r !clipbrd -r
-
-To copy text from Vim to the system clipboard just mark the text in the usual
-vim-manner and call: >
-
-	:!clipbrd -w
-
-which will write your selection right into OS/2's clipboard.
-
-For ease of use you might want to add some maps for these commands.  E.g. to
-use F11 to paste the clipboard into Vim and F12 to copy selected text to the
-clipboard you would use: >
-
-	if has("os2")
-	  imap <F11>     <ESC>:r !clipbrd -r<CR>i
-	  vmap <F12>     :!clipbrd -w<cr>
-	else
-	  imap <F11>     <ESC>"*p<CR>i
-	  vmap <F12>     "*y
-	endif
-
-This will ensure that only on OS/2 clipbrd is called whereas on other
-platforms vims build in mechanism is used.  (To enable this functions on every
-load of Vim place the above lines in your .vimrc.)
-
  vim:tw=78:ts=8:ft=help:norl:
diff --git a/src/INSTALL b/src/INSTALL
index 54297d1..521d058 100644
--- a/src/INSTALL
+++ b/src/INSTALL
@@ -176,46 +176,7 @@
 3. OS/2
 =======
 
-Summary:
-ren Makefile Makefile.unix
-ren makefile.os2 Makefile
-make
-
-This port of Vim to OS/2 is based on the emx environment together
-with GNU C. The main design goal of emx is to simplify porting Unix
-software to OS/2 and DOS. Because of this, almost all the Unix defines
-etc. already existing in the Vim source code could be reused. Only where
-OS/2 specifics came into play were additional changes necessary. Those
-places can be found by searching for "OS2" and "__EMX__" (I've tried to
-keep emx-specific things separate from generic OS/2 stuff).
-
-Note: This OS/2 port works well for me and an additional OS/2 user on
-      the Vim development team (Karsten Sievert); however, since I
-      haven't had any other feedback from other people, that either
-      means no (OS/2-specific) bugs exist, or no one has yet created
-      a situation in which any bugs are apparent.
-      Report any problems or other comments to paul@wau.mis.ah.nl
-      (email valid up to at least September 1996, after that try
-      paul@wurtel.hobby.nl, paul@murphy.nl, or paulS@toecompst.nl).
-      Textmode/notextmode and binary mode both seem to work well.
-
-Prerequisites:
-- To compile, you need the emx environment (at least rev. 0.9b), GCC,
-  some make utility (GNU make works fine). These are generally
-  available as (ask Archie about them):
-    emxrt.zip     emx runtime package
-    emxdev.zip    emx development system (without compiler)
-  GNU programs compiled for emx, patches and patched sources:
-    gnudev1.zip   GNU development tools compiled for emx (part 1)
-    gnudev2.zip   GNU development tools compiled for emx (part 2)
-    gnumake.zip   GNU make
-- Don't set a TERM environment variable; Vim defaults to os2ansi
-  which is available as a builtin termcap entry. Using other values
-  may give problems! (OS/2 ANSI emulation is quite limited.) If you
-  need to set TERM for other programs, you may consider putting
-  set term=os2ansi in the vimrc file.
-
-Check ../runtime/doc/os_os2.txt for additional info on running Vim.
+OS/2 support was removed in patch 7.4.1008
 
 
 4. Atari MiNT
diff --git a/src/Make_os2.mak b/src/Make_os2.mak
deleted file mode 100644
index cd62d1c..0000000
--- a/src/Make_os2.mak
+++ /dev/null
@@ -1,163 +0,0 @@
-#
-# Makefile for VIM on OS/2 using EMX	vim:ts=8:sw=8:tw=78
-#
-# Created by: Paul Slootman
-#
-
-### This Makefile has been successfully tested on these systems.
-### Check the (*) column for remarks, listed below.
-### Later code changes may cause small problems, otherwise Vim is supposed to
-### compile and run without problems.
-### Just to show that this is just like the Unix version!
-
-#system:	      configurations:		     version (*) tested by:
-#-------------	      ------------------------	     -------  -  ----------
-#OS/2 Warp HPFS       gcc-2.7.2+emx-0.9b -GUI		4.5	 Paul Slootman
-#OS/2 FAT	      gcc-2.6.3+emx	 -GUI		4.5	 Karsten Sievert
-
-#>>>>> choose options:
-
-### See feature.h for a list of optionals.
-### Any other defines can be included here.
-
-DEFINES = -DUSE_SYSTEM=1
-
-#>>>>> name of the compiler and linker, name of lib directory
-CC = gcc
-
-#>>>>> end of choices
-
-### Name of target(s)
-TARGET = vim.exe
-
-### Names of the tools that are also made
-TOOLS = xxd/xxd.exe tee/tee.exe
-
-###########################################################################
-
-INCL = vim.h globals.h option.h keymap.h macros.h ascii.h term.h os_unix.h structs.h os_os2_cfg.h
-CFLAGS = -O2 -fno-strength-reduce -DOS2 -Wall -Iproto $(DEFINES)
-
-OBJ = \
-	blowfish.o \
-	buffer.o \
-	charset.o \
-	crypt.o \
-	crypt_zip.o \
-	diff.o \
-	digraph.o \
-	edit.o \
-	eval.o \
-	ex_cmds.o \
-	ex_cmds2.o \
-	ex_docmd.o \
-	ex_eval.o \
-	ex_getln.o \
-	fileio.o \
-	fold.o \
-	getchar.o \
-	hardcopy.o \
-	hashtab.o \
-	main.o \
-	mark.o \
-	memfile.o \
-	memline.o \
-	menu.o \
-	message.o \
-	misc1.o \
-	misc2.o \
-	move.o \
-	mbyte.o \
-	normal.o \
-	ops.o \
-	option.o \
-	popupmnu.o \
-	quickfix.o \
-	regexp.o \
-	screen.o \
-	search.o \
-	sha256.o \
-	spell.o \
-	syntax.o \
-	tag.o \
-	term.o \
-	ui.o \
-	undo.o \
-	window.o \
-	os_unix.o
-
-LIBS = -ltermcap
-
-# Default target is making the executable
-all: $(TARGET) $(TOOLS)
-
-# Link the target for normal use
-LFLAGS = -Zcrtdll -s -o $(TARGET) $(LIBS)
-
-$(TARGET): $(OBJ) version.c version.h
-	$(CC) $(CFLAGS) version.c $(OBJ) $(LFLAGS)
-
-xxd/xxd.exe: xxd/xxd.c
-	cd xxd & $(MAKE) -f Make_os2.mak
-
-tee/tee.exe: tee/tee.c
-	cd tee & $(MAKE) -f Makefile
-
-test:
-	cd testdir & $(MAKE) -f Make_os2.mak
-
-clean:
-	-del *.o
-	-del *.exe
-	-del *.~ *~ *.bak
-	cd xxd   & $(MAKE) -f Make_os2.mak clean
-	cd tee   & $(MAKE) -f Makefile clean
-
-###########################################################################
-
-os_unix.o:	os_unix.c  $(INCL)
-blowfish.o:	blowfish.c  $(INCL)
-buffer.o:	buffer.c  $(INCL)
-charset.o:	charset.c  $(INCL)
-crypt.o:	crypt.c  $(INCL)
-crypt_zip.o:	crypt_zip.c  $(INCL)
-diff.o:		diff.c  $(INCL)
-digraph.o:	digraph.c  $(INCL)
-edit.o:		edit.c  $(INCL)
-eval.o:		eval.c  $(INCL)
-ex_cmds.o:	ex_cmds.c  $(INCL)
-ex_cmds2.o:	ex_cmds2.c  $(INCL)
-ex_docmd.o:	ex_docmd.c  $(INCL) ex_cmds.h
-ex_eval.o:	ex_eval.c  $(INCL) ex_cmds.h
-ex_getln.o:	ex_getln.c  $(INCL)
-fileio.o:	fileio.c  $(INCL)
-fold.o:		fold.c  $(INCL)
-getchar.o:	getchar.c  $(INCL)
-hardcopy.o:	hardcopy.c  $(INCL)
-hashtab.o:	hashtab.c  $(INCL)
-main.o:		main.c  $(INCL)
-mark.o:		mark.c  $(INCL)
-memfile.o:	memfile.c  $(INCL)
-memline.o:	memline.c  $(INCL)
-menu.o:		menu.c  $(INCL)
-message.o:	message.c  $(INCL)
-misc1.o:	misc1.c  $(INCL)
-misc2.o:	misc2.c  $(INCL)
-move.o:		move.c  $(INCL)
-mbyte.o:	mbyte.c  $(INCL)
-normal.o:	normal.c  $(INCL)
-ops.o:		ops.c  $(INCL)
-option.o:	option.c  $(INCL)
-popupmnu.o:	popupmnu.c  $(INCL)
-quickfix.o:	quickfix.c  $(INCL)
-regexp.o:	regexp.c  $(INCL)
-screen.o:	screen.c  $(INCL)
-search.o:	search.c  $(INCL)
-sha256.o:	sha256.c  $(INCL)
-spell.o:	spell.c  $(INCL)
-syntax.o:	syntax.c  $(INCL)
-tag.o:		tag.c  $(INCL)
-term.o:		term.c  $(INCL)
-ui.o:		ui.c  $(INCL)
-undo.o:		undo.c  $(INCL)
-window.o:	window.c  $(INCL)
diff --git a/src/digraph.c b/src/digraph.c
index 9f7d0cc..ba24e3f 100644
--- a/src/digraph.c
+++ b/src/digraph.c
@@ -39,7 +39,7 @@
  * compilers cannot handle them (Amiga SAS/C is the most picky one).
  */
 static digr_T digraphdefault[] =
-#if defined(MSDOS) || defined(OS2)
+#if defined(MSDOS)
 	/*
 	 * MSDOS digraphs.
 	 */
@@ -105,7 +105,7 @@
 	{NUL, NUL, NUL}
 	};
 
-#else	/* !MSDOS && !OS2 */
+#else	/* !MSDOS */
 # ifdef __MINT__
 
 	/*
@@ -2007,7 +2007,7 @@
 #   endif /* EBCDIC */
 #  endif    /* !HPUX_DIGRAPHS */
 # endif	/* !__MINT__ */
-#endif	/* !MSDOS && !OS2 */
+#endif	/* !MSDOS */
 
 /*
  * handle digraphs after typing a character
diff --git a/src/eval.c b/src/eval.c
index eca8224..8b972df 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -12791,9 +12791,6 @@
 #if defined(MACOS_X_UNIX)
 	"macunix",
 #endif
-#ifdef OS2
-	"os2",
-#endif
 #ifdef __QNX__
 	"qnx",
 #endif
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 73a5564..f3cb4b4 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -1570,7 +1570,7 @@
     char_u	*buf;
     long_u	len;
 
-#if (defined(UNIX) && !defined(ARCHIE)) || defined(OS2)
+#if defined(UNIX) && !defined(ARCHIE)
     int		is_fish_shell;
     char_u	*shell_name = get_isolated_shell_name();
 
@@ -1590,7 +1590,7 @@
     if (buf == NULL)
 	return NULL;
 
-#if (defined(UNIX) && !defined(ARCHIE)) || defined(OS2)
+#if defined(UNIX) && !defined(ARCHIE)
     /*
      * Put braces around the command (for concatenated commands) when
      * redirecting input and/or output.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 31b51e9..0e8e7bd 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3794,7 +3794,7 @@
 
 	/* Check for environment variable */
 	if (*xp->xp_pattern == '$'
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 		|| *xp->xp_pattern == '%'
 #endif
 		)
@@ -5073,7 +5073,7 @@
 		 * For Unix and OS/2, when wildcards are expanded, this is
 		 * done by ExpandOne() below.
 		 */
-#if defined(UNIX) || defined(OS2)
+#if defined(UNIX)
 		if (!has_wildcards)
 #endif
 		    backslash_halve(eap->arg);
diff --git a/src/ex_getln.c b/src/ex_getln.c
index b6aeacf..3919466 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4955,7 +4955,7 @@
 	if (*s == ' ')
 	    ++s;	/* Skip space used for absolute path name. */
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	e = vim_strchr(s, ';');
 #else
 	e = vim_strchr(s, ':');
diff --git a/src/feature.h b/src/feature.h
index c499d9d..c2bf260 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -60,7 +60,7 @@
  */
 #if !defined(FEAT_TINY) && !defined(FEAT_SMALL) && !defined(FEAT_NORMAL) \
 	&& !defined(FEAT_BIG) && !defined(FEAT_HUGE)
-# if defined(MSWIN) || defined(DJGPP) || defined(OS2) || defined(VMS) || defined(MACOS) || defined(AMIGA)
+# if defined(MSWIN) || defined(DJGPP) || defined(VMS) || defined(MACOS) || defined(AMIGA)
 #  define FEAT_BIG
 # else
 #  ifdef MSDOS
@@ -1046,7 +1046,7 @@
  * +mouse		Any mouse support (any of the above enabled).
  */
 /* OS/2 and Amiga console have no mouse support */
-#if !defined(AMIGA) && !defined(OS2)
+#if !defined(AMIGA)
 # ifdef FEAT_NORMAL
 #  define FEAT_MOUSE_XTERM
 # endif
diff --git a/src/fileio.c b/src/fileio.c
index 9224777..362d82e 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -445,7 +445,7 @@
 	    return FAIL;
 	}
 #endif
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	/*
 	 * MS-Windows allows opening a device, but we will probably get stuck
 	 * trying to read it.
@@ -526,7 +526,7 @@
     file_readonly = FALSE;
     if (read_stdin)
     {
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	/* Force binary I/O on stdin to avoid CR-LF -> LF conversion. */
 	setmode(0, O_BINARY);
 #endif
@@ -3553,7 +3553,7 @@
     }
     if (c == NODE_WRITABLE)
     {
-# if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+# if defined(MSDOS) || defined(MSWIN)
 	/* MS-Windows allows opening a device, but we will probably get stuck
 	 * trying to write to it.  */
 	if (!p_odev)
@@ -6055,7 +6055,7 @@
     if (fnamencmp(dir_name, full_path, len) == 0)
     {
 	p = full_path + len;
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	/*
 	 * MSDOS: when a file is in the root directory, dir_name will end in a
 	 * slash, since C: by itself does not define a specific dir. In this
@@ -6072,7 +6072,7 @@
 #endif
 	}
     }
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
     /*
      * When using a file in the current drive, remove the drive name:
      * "A:\dir\file" -> "\dir\file".  This helps when moving a session file on
@@ -6330,7 +6330,7 @@
 	else if ((int)STRLEN(e) + extlen > 4)
 	    s = e + 4 - extlen;
     }
-#if defined(OS2) || defined(USE_LONG_FNAME) || defined(WIN3264)
+#if defined(USE_LONG_FNAME) || defined(WIN3264)
     /*
      * If there is no file name, and the extension starts with '.', put a
      * '_' before the dot, because just ".ext" may be invalid if it's on a
diff --git a/src/getchar.c b/src/getchar.c
index f4ec991..70829e1 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -962,8 +962,8 @@
 }
 
 /*
- * insert a string in position 'offset' in the typeahead buffer (for "@r"
- * and ":normal" command, vgetorpeek() and check_termcode())
+ * Insert a string in position 'offset' in the typeahead buffer (for "@r"
+ * and ":normal" command, vgetorpeek() and check_termcode()).
  *
  * If noremap is REMAP_YES, new string can be mapped again.
  * If noremap is REMAP_NONE, new string cannot be mapped again.
@@ -5295,7 +5295,7 @@
 }
 #endif
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(MACOS)
+#if defined(MSDOS) || defined(MSWIN) || defined(MACOS)
 
 #define VIS_SEL	(VISUAL+SELECTMODE)	/* abbreviation */
 
@@ -5308,7 +5308,7 @@
     int		mode;
 } initmappings[] =
 {
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	/* Use the Windows (CUA) keybindings. */
 # ifdef FEAT_GUI
 	/* paste, copy and cut */
@@ -5379,7 +5379,7 @@
     void
 init_mappings()
 {
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(MACOS)
+#if defined(MSDOS) || defined(MSWIN) ||defined(MACOS)
     int		i;
 
     for (i = 0; i < sizeof(initmappings) / sizeof(struct initmap); ++i)
@@ -5387,7 +5387,7 @@
 #endif
 }
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) \
+#if defined(MSDOS) || defined(MSWIN) \
 	|| defined(FEAT_CMDWIN) || defined(MACOS) || defined(PROTO)
 /*
  * Add a mapping "map" for mode "mode".
diff --git a/src/globals.h b/src/globals.h
index f0879dc..d921a4e 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -19,7 +19,7 @@
  */
 EXTERN long	Rows			/* nr of rows in the screen */
 #ifdef DO_INIT
-# if defined(MSDOS) || defined(WIN3264) || defined(OS2)
+# if defined(MSDOS) || defined(WIN3264)
 			    = 25L
 # else
 			    = 24L
@@ -1534,7 +1534,7 @@
 #endif
 EXTERN char_u e_secure[]	INIT(= N_("E523: Not allowed here"));
 #if defined(AMIGA) || defined(MACOS) || defined(MSWIN)  \
-	|| defined(UNIX) || defined(VMS) || defined(OS2)
+	|| defined(UNIX) || defined(VMS)
 EXTERN char_u e_screenmode[]	INIT(= N_("E359: Screen mode setting not supported"));
 #endif
 EXTERN char_u e_scroll[]	INIT(= N_("E49: Invalid scroll size"));
diff --git a/src/macros.h b/src/macros.h
index caaca9a..737eddf 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -231,7 +231,7 @@
 #if defined(UNIX) || defined(VMS)  /* open in rw------- mode */
 # define mch_open_rw(n, f)	mch_open((n), (f), (mode_t)0600)
 #else
-# if defined(MSDOS) || defined(MSWIN) || defined(OS2)  /* open read/write */
+# if defined(MSDOS) || defined(MSWIN)  /* open read/write */
 #  define mch_open_rw(n, f)	mch_open((n), (f), S_IREAD | S_IWRITE)
 # else
 #  define mch_open_rw(n, f)	mch_open((n), (f), 0)
diff --git a/src/memline.c b/src/memline.c
index a1c07a9..cd6d151 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -4211,8 +4211,7 @@
 #endif
     char_u	*buf_fname = buf->b_fname;
 
-#if !defined(SHORT_FNAME) \
-		&& ((!defined(UNIX) && !defined(OS2)) || defined(ARCHIE))
+#if !defined(SHORT_FNAME) && (!defined(UNIX) || defined(ARCHIE))
 # define CREATE_DUMMY_FILE
     FILE	*dummyfd = NULL;
 
@@ -4272,7 +4271,7 @@
 	    fname = NULL;
 	    break;
 	}
-#if (defined(UNIX) || defined(OS2)) && !defined(ARCHIE) && !defined(SHORT_FNAME)
+#if defined(UNIX) && !defined(ARCHIE) && !defined(SHORT_FNAME)
 /*
  * Some systems have a MS-DOS compatible filesystem that use 8.3 character
  * file names. If this is the first try and the swap file name does not fit in
@@ -4323,10 +4322,6 @@
 		    {
 			f1 = mch_open_rw((char *)fname,
 					       O_RDWR|O_CREAT|O_EXCL|O_EXTRA);
-#if defined(OS2)
-			if (f1 < 0 && errno == ENOENT)
-			    same = TRUE;
-#endif
 			created1 = TRUE;
 		    }
 		    if (f1 >= 0)
diff --git a/src/misc1.c b/src/misc1.c
index 5190db4..d1e762c 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -3856,7 +3856,7 @@
 # endif
 #endif
 
-#if defined(OS2) || defined(MSDOS) || defined(MSWIN)
+#if defined(MSDOS) || defined(MSWIN)
     /*
      * Default home dir is C:/
      * Best assumption we can make in such a situation.
@@ -3995,7 +3995,7 @@
 		    && at_start
 #endif
 	   )
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 		|| *src == '%'
 #endif
 		|| (*src == '~' && at_start))
@@ -4024,21 +4024,16 @@
 #endif
 		{
 		    while (c-- > 0 && *tail != NUL && ((vim_isIDc(*tail))
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 			    || (*src == '%' && *tail != '%')
 #endif
 			    ))
 		    {
-#ifdef OS2		/* env vars only in uppercase */
-			*var++ = TOUPPER_LOC(*tail);
-			tail++;	    /* toupper() may be a macro! */
-#else
 			*var++ = *tail++;
-#endif
 		    }
 		}
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(UNIX)
+#if defined(MSDOS) || defined(MSWIN) || defined(UNIX)
 # ifdef UNIX
 		if (src[1] == '{' && *tail != '}')
 # else
@@ -4056,7 +4051,7 @@
 #endif
 		    *var = NUL;
 		    var = vim_getenv(dst, &mustfree);
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(UNIX)
+#if defined(MSDOS) || defined(MSWIN) || defined(UNIX)
 		}
 #endif
 	    }
@@ -4249,7 +4244,7 @@
     char_u	*pend;
     int		vimruntime;
 
-#if defined(OS2) || defined(MSDOS) || defined(MSWIN)
+#if defined(MSDOS) || defined(MSWIN)
     /* use "C:/" when $HOME is not set */
     if (STRCMP(name, "HOME") == 0)
 	return homedir;
@@ -5000,7 +4995,7 @@
 {
     char_u  *retval;
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
     /* may skip "c:" */
     if (isalpha(path[0]) && path[1] == ':')
 	retval = path + 2;
@@ -10882,7 +10877,7 @@
 	if (*p == '\\' && p[1] != NUL)
 	    ++p;
 	else if (vim_strchr((char_u *)
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 				    "$%"
 #else
 				    "$"
diff --git a/src/misc2.c b/src/misc2.c
index beb3d46..f13a80e 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -5521,7 +5521,7 @@
     if (vim_isAbsName(ff_file_to_find)
 	    /* "..", "../path", "." and "./path": don't use the path_option */
 	    || rel_to_curdir
-#if defined(MSWIN) || defined(MSDOS) || defined(OS2)
+#if defined(MSWIN) || defined(MSDOS)
 	    /* handle "\tmp" as absolute path */
 	    || vim_ispathsep(ff_file_to_find[0])
 	    /* handle "c:name" as absolute path */
diff --git a/src/netbeans.c b/src/netbeans.c
index ea0c017..2c15227 100644
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -1862,7 +1862,7 @@
 		if (buf_was_empty)
 		{
 		    if (ff_detected == EOL_UNKNOWN)
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 			ff_detected = EOL_DOS;
 #else
 			ff_detected = EOL_UNIX;
diff --git a/src/option.c b/src/option.c
index 0c38de6..dae2054 100644
--- a/src/option.c
+++ b/src/option.c
@@ -464,7 +464,7 @@
 
 /* 'isprint' for latin1 is also used for MS-Windows cp1252, where 0x80 is used
  * for the currency sign. */
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 # define ISP_LATIN1 (char_u *)"@,~-255"
 #else
 # define ISP_LATIN1 (char_u *)"@,161-255"
@@ -501,7 +501,7 @@
 			    (char_u *)NULL, PV_NONE,
 #endif
 			    {
-#if (defined(MSDOS) || defined(WIN3264) || defined(OS2)) && !defined(FEAT_GUI_W32)
+#if (defined(MSDOS) || defined(WIN3264)) && !defined(FEAT_GUI_W32)
 			    (char_u *)128L,
 #else
 			    (char_u *)224L,
@@ -576,7 +576,7 @@
     {"background",  "bg",   P_STRING|P_VI_DEF|P_RCLR,
 			    (char_u *)&p_bg, PV_NONE,
 			    {
-#if (defined(MSDOS) || defined(OS2) || defined(WIN3264)) && !defined(FEAT_GUI)
+#if (defined(MSDOS) || defined(WIN3264)) && !defined(FEAT_GUI)
 			    (char_u *)"dark",
 #else
 			    (char_u *)"light",
@@ -1600,7 +1600,7 @@
     {"isident",	    "isi",  P_STRING|P_VI_DEF|P_COMMA|P_NODUP,
 			    (char_u *)&p_isi, PV_NONE,
 			    {
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 			    (char_u *)"@,48-57,_,128-167,224-235",
 #else
 # ifdef EBCDIC
@@ -1626,7 +1626,7 @@
 				    "251-254",
 #else
 				(char_u *)"@,48-57,_",
-# if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+# if defined(MSDOS) || defined(MSWIN)
 				(char_u *)"@,48-57,_,128-167,224-235"
 # else
 				ISK_LATIN1
@@ -1636,7 +1636,7 @@
     {"isprint",	    "isp",  P_STRING|P_VI_DEF|P_RALL|P_COMMA|P_NODUP,
 			    (char_u *)&p_isp, PV_NONE,
 			    {
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) \
+#if defined(MSDOS) || defined(MSWIN) \
 		|| (defined(MACOS) && !defined(MACOS_X)) \
 		|| defined(VMS)
 			    (char_u *)"@,~-255",
@@ -1682,14 +1682,10 @@
 #ifdef VMS
 			    (char_u *)"help",
 #else
-# if defined(OS2)
-			    (char_u *)"view /",
-# else
-#  ifdef USEMAN_S
+# ifdef USEMAN_S
 			    (char_u *)"man -s",
-#  else
+# else
 			    (char_u *)"man",
-#  endif
 # endif
 #endif
 #endif
@@ -1737,7 +1733,7 @@
     {"lines",	    NULL,   P_NUM|P_NODEFAULT|P_NO_MKRC|P_VI_DEF|P_RCLR,
 			    (char_u *)&Rows, PV_NONE,
 			    {
-#if defined(MSDOS) || defined(WIN3264) || defined(OS2)
+#if defined(MSDOS) || defined(WIN3264)
 			    (char_u *)25L,
 #else
 			    (char_u *)24L,
@@ -1969,7 +1965,7 @@
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCRIPTID_INIT},
     {"opendevice",  "odev", P_BOOL|P_VI_DEF,
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 			    (char_u *)&p_odev, PV_NONE,
 #else
 			    (char_u *)NULL, PV_NONE,
@@ -2301,14 +2297,10 @@
 #   if defined(WIN3264)
 			    (char_u *)"",	/* set in set_init_1() */
 #   else
-#    if defined(OS2)
-			    (char_u *)"cmd.exe",
-#    else
-#     if defined(ARCHIE)
+#    if defined(ARCHIE)
 			    (char_u *)"gos",
-#     else
+#    else
 			    (char_u *)"sh",
-#     endif
 #    endif
 #   endif
 #  endif
@@ -2321,18 +2313,14 @@
 #if defined(MSDOS) || defined(MSWIN)
 			    (char_u *)"/c",
 #else
-# if defined(OS2)
-			    (char_u *)"/c",
-# else
 			    (char_u *)"-c",
-# endif
 #endif
 				(char_u *)0L} SCRIPTID_INIT},
     {"shellpipe",   "sp",   P_STRING|P_VI_DEF|P_SECURE,
 #ifdef FEAT_QUICKFIX
 			    (char_u *)&p_sp, PV_NONE,
 			    {
-#if defined(UNIX) || defined(OS2)
+#if defined(UNIX)
 # ifdef ARCHIE
 			    (char_u *)"2>",
 # else
@@ -2765,7 +2753,7 @@
     {"undolevels",  "ul",   P_NUM|P_VI_DEF,
 			    (char_u *)&p_ul, PV_UL,
 			    {
-#if defined(UNIX) || defined(WIN3264) || defined(OS2) || defined(VMS)
+#if defined(UNIX) || defined(WIN3264) || defined(VMS)
 			    (char_u *)1000L,
 #else
 			    (char_u *)100L,
@@ -2807,7 +2795,7 @@
     {"viminfo",	    "vi",   P_STRING|P_ONECOMMA|P_NODUP|P_SECURE,
 #ifdef FEAT_VIMINFO
 			    (char_u *)&p_viminfo, PV_NONE,
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 			    {(char_u *)"", (char_u *)"'100,<50,s10,h,rA:,rB:"}
 #else
 # ifdef AMIGA
@@ -3199,7 +3187,7 @@
      * Don't use it if it is empty.
      */
     if (((p = mch_getenv((char_u *)"SHELL")) != NULL && *p != NUL)
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 # ifdef __EMX__
 	    || ((p = mch_getenv((char_u *)"EMXSHELL")) != NULL && *p != NUL)
 # endif
@@ -3349,10 +3337,10 @@
     }
 #endif
 
-#if defined(FEAT_POSTSCRIPT) && (defined(MSWIN) || defined(OS2) || defined(VMS) || defined(EBCDIC) || defined(MAC) || defined(hpux))
+#if defined(FEAT_POSTSCRIPT) && (defined(MSWIN) || defined(VMS) || defined(EBCDIC) || defined(MAC) || defined(hpux))
     /* Set print encoding on platforms that don't default to latin1 */
     set_string_default("penc",
-# if defined(MSWIN) || defined(OS2)
+# if defined(MSWIN)
 		       (char_u *)"cp1252"
 # else
 #  ifdef VMS
@@ -3375,7 +3363,7 @@
 #ifdef FEAT_POSTSCRIPT
     /* 'printexpr' must be allocated to be able to evaluate it. */
     set_string_default("pexpr",
-# if defined(MSWIN) || defined(MSDOS) || defined(OS2)
+# if defined(MSWIN) || defined(MSDOS)
 	    (char_u *)"system('copy' . ' ' . v:fname_in . (&printdevice == '' ? ' LPT1:' : (' \"' . &printdevice . '\"'))) . delete(v:fname_in)"
 # else
 #  ifdef VMS
@@ -3525,7 +3513,7 @@
 		options[opt_idx].flags |= P_DEF_ALLOCED;
 	    }
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2) || defined(MACOS) \
+#if defined(MSDOS) || defined(MSWIN) || defined(MACOS) \
 		|| defined(VMS)
 	    if (STRCMP(p_enc, "latin1") == 0
 # ifdef FEAT_MBYTE
@@ -3809,7 +3797,7 @@
     set_number_default("window", Rows - 1);
 
     /* For DOS console the default is always black. */
-#if !((defined(MSDOS) || defined(OS2) || defined(WIN3264)) && !defined(FEAT_GUI))
+#if !((defined(MSDOS) || defined(WIN3264)) && !defined(FEAT_GUI))
     /*
      * If 'background' wasn't set by the user, try guessing the value,
      * depending on the terminal name.  Only need to check for terminals
@@ -3852,7 +3840,7 @@
     static char_u *
 term_bg_default()
 {
-#if defined(MSDOS) || defined(OS2) || defined(WIN3264)
+#if defined(MSDOS) || defined(WIN3264)
     /* DOS console nearly always black */
     return (char_u *)"dark";
 #else
@@ -3877,7 +3865,7 @@
     void
 set_init_3()
 {
-#if defined(UNIX) || defined(OS2) || defined(WIN3264)
+#if defined(UNIX) || defined(WIN3264)
 /*
  * Set 'shellpipe' and 'shellredir', depending on the 'shell' option.
  * This is done after other initializations, where 'shell' might have been
@@ -3886,23 +3874,23 @@
     char_u  *p;
     int	    idx_srr;
     int	    do_srr;
-#ifdef FEAT_QUICKFIX
+# ifdef FEAT_QUICKFIX
     int	    idx_sp;
     int	    do_sp;
-#endif
+# endif
 
     idx_srr = findoption((char_u *)"srr");
     if (idx_srr < 0)
 	do_srr = FALSE;
     else
 	do_srr = !(options[idx_srr].flags & P_WAS_SET);
-#ifdef FEAT_QUICKFIX
+# ifdef FEAT_QUICKFIX
     idx_sp = findoption((char_u *)"sp");
     if (idx_sp < 0)
 	do_sp = FALSE;
     else
 	do_sp = !(options[idx_sp].flags & P_WAS_SET);
-#endif
+# endif
     p = get_isolated_shell_name();
     if (p != NULL)
     {
@@ -3912,23 +3900,23 @@
 	 */
 	if (	   fnamecmp(p, "csh") == 0
 		|| fnamecmp(p, "tcsh") == 0
-# if defined(OS2) || defined(WIN3264)	/* also check with .exe extension */
+# if defined(WIN3264)	/* also check with .exe extension */
 		|| fnamecmp(p, "csh.exe") == 0
 		|| fnamecmp(p, "tcsh.exe") == 0
 # endif
 	   )
 	{
-#if defined(FEAT_QUICKFIX)
+# if defined(FEAT_QUICKFIX)
 	    if (do_sp)
 	    {
-# ifdef WIN3264
+#  ifdef WIN3264
 		p_sp = (char_u *)">&";
-# else
+#  else
 		p_sp = (char_u *)"|& tee";
-# endif
+#  endif
 		options[idx_sp].def_val[VI_DEFAULT] = p_sp;
 	    }
-#endif
+# endif
 	    if (do_srr)
 	    {
 		p_srr = (char_u *)">&";
@@ -3936,7 +3924,7 @@
 	    }
 	}
 	else
-# ifndef OS2	/* Always use bourne shell style redirection if we reach this */
+	    /* Always use bourne shell style redirection if we reach this */
 	    if (       fnamecmp(p, "sh") == 0
 		    || fnamecmp(p, "ksh") == 0
 		    || fnamecmp(p, "mksh") == 0
@@ -3945,7 +3933,7 @@
 		    || fnamecmp(p, "zsh-beta") == 0
 		    || fnamecmp(p, "bash") == 0
 		    || fnamecmp(p, "fish") == 0
-#  ifdef WIN3264
+# ifdef WIN3264
 		    || fnamecmp(p, "cmd") == 0
 		    || fnamecmp(p, "sh.exe") == 0
 		    || fnamecmp(p, "ksh.exe") == 0
@@ -3955,21 +3943,20 @@
 		    || fnamecmp(p, "zsh-beta.exe") == 0
 		    || fnamecmp(p, "bash.exe") == 0
 		    || fnamecmp(p, "cmd.exe") == 0
-#  endif
-		    )
 # endif
+		    )
 	    {
-#if defined(FEAT_QUICKFIX)
+# if defined(FEAT_QUICKFIX)
 		if (do_sp)
 		{
-# ifdef WIN3264
+#  ifdef WIN3264
 		    p_sp = (char_u *)">%s 2>&1";
-# else
+#  else
 		    p_sp = (char_u *)"2>&1| tee";
-# endif
+#  endif
 		    options[idx_sp].def_val[VI_DEFAULT] = p_sp;
 		}
-#endif
+# endif
 		if (do_srr)
 		{
 		    p_srr = (char_u *)">%s 2>&1";
@@ -3980,7 +3967,7 @@
     }
 #endif
 
-#if defined(MSDOS) || defined(WIN3264) || defined(OS2)
+#if defined(MSDOS) || defined(WIN3264)
     /*
      * Set 'shellcmdflag', 'shellxquote', and 'shellquote' depending on the
      * 'shell' option.
@@ -7043,7 +7030,7 @@
     {
 	if (VIM_ISDIGIT(*p_bs))
 	{
-	    if (*p_bs >'2' || p_bs[1] != NUL)
+	    if (*p_bs > '2' || p_bs[1] != NUL)
 		errmsg = e_invarg;
 	}
 	else if (check_opt_strings(p_bs, p_bs_values, TRUE) != OK)
diff --git a/src/option.h b/src/option.h
index d994d2d..7da6b8a 100644
--- a/src/option.h
+++ b/src/option.h
@@ -671,7 +671,7 @@
 #ifdef FEAT_MZSCHEME
 EXTERN long	p_mzq;		/* 'mzquantum */
 #endif
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 EXTERN int	p_odev;		/* 'opendevice' */
 #endif
 EXTERN char_u	*p_opfunc;	/* 'operatorfunc' */
diff --git a/src/os_os2_cfg.h b/src/os_os2_cfg.h
deleted file mode 100644
index eef8bf5..0000000
--- a/src/os_os2_cfg.h
+++ /dev/null
@@ -1,254 +0,0 @@
-/* os_os2_cfg.h */
-/* vi:set ts=8 sts=4 sw=4: */
-
-#define CASE_INSENSITIVE_FILENAME   /* ignore case when comparing file names */
-#define SPACE_IN_FILENAME
-#define BACKSLASH_IN_FILENAME
-#define BINARY_FILE_IO
-#define USE_CRNL		/* lines end in CR-NL instead of NL */
-#define NO_EXPANDPATH		/* always call mch_expand_wildcards */
-#define USE_EXE_NAME		/* use argv[0] for $VIM */
-#define USE_TERM_CONSOLE
-#define HAVE_DUP		/* have dup() */
-
-#define FNAME_ILLEGAL "\"*?><|" /* illegal characters in a file name */
-
-/*
- * The rest is manually generated from configure.in by Paul Slootman.
- */
-
-/* Define unless no X support found */
-#undef HAVE_X11
-
-/* Define when terminfo support found */
-#undef TERMINFO
-
-/* Define when termcap.h contains ospeed */
-#define HAVE_OSPEED	1
-
-#define HAVE_STRICMP
-#define HAVE_STRNICMP
-
-/* Define when ospeed can be extern */
-#define OSPEED_EXTERN
-
-/* Define when termcap.h contains UP, BC and PC */
-#define HAVE_UP_BC_PC	1
-
-/* Define when UP, BC and PC can be extern */
-#define UP_BC_PC_EXTERN
-
-/* Define when termcap.h defines outfuntype */
-#undef HAVE_OUTFUNTYPE
-
-/* Define when __DATE__ " " __TIME__ can be used */
-#define HAVE_DATE_TIME	1
-
-#undef UNIX	/* define always by current configure script */
-
-/* Defined to the size of an int */
-#define VIM_SIZEOF_INT 4
-
-/*
- * If we cannot trust one of the following from the libraries, we use our
- * own safe but probably slower mch_memmove().
- */
-#define USEBCOPY	1
-#undef USEMEMMOVE
-#undef USEMEMCPY
-
-/* Define to empty if the keyword does not work.  */
-#undef const
-
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef mode_t
-
-/* Define to `long' if <sys/types.h> doesn't define.  */
-#undef off_t
-
-/* Define to `long' if <sys/types.h> doesn't define.  */
-#undef pid_t
-
-/* Define to `unsigned' if <sys/types.h> doesn't define.  */
-#undef size_t
-
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef uid_t
-
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef gid_t
-
-/* Define if you can safely include both <sys/time.h> and <time.h>.  */
-#define TIME_WITH_SYS_TIME	1
-
-/* Define if you can safely include both <sys/time.h> and <sys/select.h>.  */
-#define SYS_SELECT_WITH_SYS_TIME	1
-
-/* Define as the return type of signal handlers (int or void).	*/
-#define RETSIGTYPE void
-
-/* Define as the command at the end of signal handlers ("" or "return 0;").  */
-#define SIGRETURN
-
-/* Define if toupper/tolower only work on lower/uppercase characters */
-#undef BROKEN_TOUPPER
-
-/* Define if tgetstr() has a second argument that is (char *) */
-#undef TGETSTR_CHAR_P
-
-/* Define if you have the sigset() function.  */
-#undef HAVE_SIGSET
-
-/* Define if the getcwd() function should not be used.	*/
-#undef BAD_GETCWD
-
-/* Define if you have the getcwd() function.  */
-#define HAVE_GETCWD	1
-
-/* Define if you have the getwd() function.  */
-#define HAVE_GETWD	1
-
-/* Define if you have the select() function.  */
-#define HAVE_SELECT	1
-
-/* Define if you have the strcspn() function.  */
-#define HAVE_STRCSPN	1
-
-/* Define if you have the strtol() function.  */
-#define HAVE_STRTOL	1
-
-/* Define if you have the tgetent() function.  */
-#define HAVE_TGETENT	1
-
-#define HAVE_STRFTIME	    /* guessed */
-
-/* Define if you have the memset() function.  */
-#define HAVE_MEMSET	1
-
-/* Define if you have the strerror() function.	*/
-#define HAVE_STRERROR	1
-
-/* Define if you have the strcasecmp() function. */
-#undef HAVE_STRCASECMP
-
-/* Define if you have the fchown() function.  */
-#undef HAVE_FCHOWN
-
-/* Define if you have the rename() function. */
-#define HAVE_RENAME	1
-
-/* Define if you have the fsync() function. */
-#undef HAVE_FSYNC   /* exists, but apparently Bad Things happen when used */
-
-/* Define if you have the fchdir() function. */
-#undef HAVE_FCHDIR
-
-/* Define if you have the setenv() function. */
-#undef HAVE_SETENV
-
-/* Define if you have the putenv() function. */
-#define HAVE_PUTENV	1
-
-/* Define if you have the gettimeofday() function. */
-#undef HAVE_GETTIMEOFDAY
-
-/* Define if you have the getpwuid() function. */
-#undef HAVE_GETPWUID
-
-/* Define if you have the getpwnam() function. */
-#undef HAVE_GETPWNAM
-
-/* Define if you have the qsort() function. */
-#define HAVE_QSORT  1
-
-/* Define if you have the <dirent.h> header file.  */
-#define HAVE_DIRENT_H	1
-
-/* Define if you have the <sys/ndir.h> header file.  */
-#undef HAVE_SYS_NDIR_H
-
-/* Define if you have the <sys/dir.h> header file.  */
-#undef HAVE_SYS_DIR_H
-
-/* Define if you have the <ndir.h> header file.  */
-#undef HAVE_NDIR_H
-
-/* Define if you have <sys/wait.h> that is POSIX.1 compatible.	*/
-#define HAVE_SYS_WAIT_H 1
-
-/* Define if you have a <sys/wait.h> that is not POSIX.1 compatible. */
-#undef HAVE_UNION_WAIT
-
-/* This is currently unused in vim: */
-/* Define if you have the ANSI C header files. */
-/* #undef STDC_HEADERS */
-
-/* added by David Sanders */
-#define HAVE_STDARG_H 1
-
-/* instead, we check a few STDC things ourselves */
-#define HAVE_STDLIB_H	1
-#undef HAVE_STRING_H	/* On EMX it is better to use strings.h */
-
-/* Define if you have the <sys/select.h> header file.  */
-#undef HAVE_SYS_SELECT_H
-
-/* Define if you have the <sys/utsname.h> header file.	*/
-#define HAVE_SYS_UTSNAME_H	1
-
-/* Define if you have the <termcap.h> header file.  */
-#define HAVE_TERMCAP_H	1
-
-/* Define if you have the <fcntl.h> header file.  */
-#define HAVE_FCNTL_H	1
-
-/* Define if you have the <sgtty.h> header file.  */
-#define HAVE_SGTTY_H	1
-
-/* Define if you have the <sys/ioctl.h> header file.  */
-#define HAVE_SYS_IOCTL_H	1
-
-/* Define if you have the <sys/time.h> header file.  */
-#define HAVE_SYS_TIME_H
-
-/* Define if you have the <termio.h> header file.  */
-#undef HAVE_TERMIO_H
-
-/* Define if you have the <unistd.h> header file.  */
-#define HAVE_UNISTD_H	1
-
-/* Define if you have the <stropts.h> header file. */
-#undef HAVE_STROPTS_H
-
-/* Define if you have the <errno.h> header file. */
-#define HAVE_ERRNO_H	1
-
-/* Define if you have the <strings.h> header file. */
-#define HAVE_STRINGS_H	1
-
-/* Define if you have the <sys/systeminfo.h> header file. */
-#undef HAVE_SYS_SYSTEMINFO_H
-
-/* Define if you have the <locale.h> header file. */
-#define HAVE_LOCALE_H	1
-
-/* Define if you have the <sys/stream.h> header file. */
-#undef HAVE_SYS_STREAM_H
-
-/* Define if you have the <sys/ptem.h> header file. */
-#undef HAVE_SYS_PTEM_H
-
-/* Define if you have the <termios.h> header file. */
-#define HAVE_TERMIOS_H	1
-
-/* Define if you have the <libc.h> header file. */
-#undef HAVE_LIBC_H
-
-/* Define if you have the <sys/statfs.h> header file. */
-#undef HAVE_SYS_STATFS_H
-
-/* Define if you have the <sys/poll.h> header file. */
-#undef HAVE_SYS_POLL_H
-
-/* Define if you have the <pwd.h> header file. */
-#undef HAVE_PWD_H
diff --git a/src/os_unix.c b/src/os_unix.c
index 4c63eeb..89519fa 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -471,13 +471,6 @@
 	len = read_from_input_buf(buf, (long)maxlen);
 	if (len > 0)
 	{
-#ifdef OS2
-	    int i;
-
-	    for (i = 0; i < len; i++)
-		if (buf[i] == 0)
-		    buf[i] = K_NUL;
-#endif
 	    return len;
 	}
     }
@@ -1475,14 +1468,6 @@
     int	    argc UNUSED;
     char    **argv UNUSED;
 {
-#ifdef OS2
-    /*
-     * Store argv[0], may be used for $VIM.  Only use it if it is an absolute
-     * name, mostly it's just "vim" and found in the path, which is unusable.
-     */
-    if (mch_isFullName(argv[0]))
-	exe_name = vim_strsave((char_u *)argv[0]);
-#endif
     if (isatty(1))
 	return OK;
     return FAIL;
@@ -2446,24 +2431,6 @@
 #endif
 }
 
-#if defined(OS2) || defined(PROTO)
-/*
- * Replace all slashes by backslashes.
- * When 'shellslash' set do it the other way around.
- */
-    void
-slash_adjust(p)
-    char_u  *p;
-{
-    while (*p)
-    {
-	if (*p == psepcN)
-	    *p = psepc;
-	mb_ptr_adv(p);
-    }
-}
-#endif
-
 /*
  * Get absolute file name into "buf[len]".
  *
@@ -2476,9 +2443,6 @@
     int		force;		/* also expand when already absolute path */
 {
     int		l;
-#ifdef OS2
-    int		only_drive;	/* file name is only a drive letter */
-#endif
 #ifdef HAVE_FCHDIR
     int		fd = -1;
     static int	dont_fchdir = FALSE;	/* TRUE when fchdir() doesn't work */
@@ -2517,14 +2481,7 @@
 	 * and then do the getwd() (and get back to where we were).
 	 * This will get the correct path name with "../" things.
 	 */
-#ifdef OS2
-	only_drive = 0;
-	if (p != NULL
-		|| ((p = vim_strrchr(fname, '\\')) != NULL)
-		|| (((p = vim_strchr(fname,  ':')) != NULL) && ++only_drive))
-#else
 	if (p != NULL)
-#endif
 	{
 #ifdef HAVE_FCHDIR
 	    /*
@@ -2558,15 +2515,6 @@
 	    }
 	    else
 	    {
-#ifdef OS2
-		/*
-		 * compensate for case where ':' from "D:" was the only
-		 * path separator detected in the file name; the _next_
-		 * character has to be removed, and then restored later.
-		 */
-		if (only_drive)
-		    p++;
-#endif
 		/* The directory is copied into buf[], to be able to remove
 		 * the file name without changing it (could be a string in
 		 * read-only memory) */
@@ -2581,14 +2529,6 @@
 			fname = p + 1;
 		    *buf = NUL;
 		}
-#ifdef OS2
-		if (only_drive)
-		{
-		    p--;
-		    if (retval != FAIL)
-			fname--;
-		}
-#endif
 	    }
 	}
 	if (mch_dirname(buf, len) == FAIL)
@@ -3205,10 +3145,8 @@
 	return NODE_NORMAL;
     if (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode))
 	return NODE_NORMAL;
-#ifndef OS2
     if (S_ISBLK(st.st_mode))	/* block device isn't writable */
 	return NODE_OTHER;
-#endif
     /* Everything else is writable? */
     return NODE_WRITABLE;
 }
@@ -6321,20 +6259,14 @@
 {
     for ( ; *p; mb_ptr_adv(p))
     {
-#ifndef OS2
 	if (*p == '\\' && p[1] != NUL)
 	    ++p;
 	else
-#endif
 	    if (vim_strchr((char_u *)
 #ifdef VMS
 				    "*?%"
 #else
-# ifdef OS2
-				    "*?"
-# else
 				    "*?[{'"
-# endif
 #endif
 						, *p) != NULL)
 	    return TRUE;
@@ -6352,24 +6284,14 @@
 {
     for ( ; *p; mb_ptr_adv(p))
     {
-#ifndef OS2
 	if (*p == '\\' && p[1] != NUL)
 	    ++p;
 	else
-#endif
 	    if (vim_strchr((char_u *)
 #ifdef VMS
 				    "*?%$"
 #else
-# ifdef OS2
-#  ifdef VIM_BACKTICK
-				    "*?$`"
-#  else
-				    "*?$"
-#  endif
-# else
 				    "*?[{`'$"
-# endif
 #endif
 						, *p) != NULL
 		|| (*p == '~' && p[1] != NUL))
diff --git a/src/os_unix.h b/src/os_unix.h
index 5fc95ee..0dd75cf 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -274,9 +274,6 @@
 # endif
 #endif
 
-#if !defined(USR_EXRC_FILE2) && defined(OS2)
-# define USR_EXRC_FILE2 "$VIM/.exrc"
-#endif
 #if !defined(USR_EXRC_FILE2) && defined(VMS)
 # define USR_EXRC_FILE2 "sys$login:_exrc"
 #endif
@@ -291,20 +288,13 @@
 
 
 #if !defined(USR_VIMRC_FILE2)
-# ifdef OS2
-#  define USR_VIMRC_FILE2	"$HOME/vimfiles/vimrc"
+# ifdef VMS
+#  define USR_VIMRC_FILE2	"sys$login:vimfiles/vimrc"
 # else
-#  ifdef VMS
-#   define USR_VIMRC_FILE2	"sys$login:vimfiles/vimrc"
-#  else
-#    define USR_VIMRC_FILE2	"~/.vim/vimrc"
-#  endif
+#   define USR_VIMRC_FILE2	"~/.vim/vimrc"
 # endif
 #endif
 
-#if !defined(USR_VIMRC_FILE3) && defined(OS2)
-# define USR_VIMRC_FILE3 "$VIM/.vimrc"
-#endif
 #if !defined(USR_VIMRC_FILE3) && defined(VMS)
 # define USR_VIMRC_FILE3 "sys$login:_vimrc"
 #endif
@@ -318,14 +308,10 @@
 #endif
 
 #ifndef USR_GVIMRC_FILE2
-# ifdef OS2
-#  define USR_GVIMRC_FILE2	"$HOME/vimfiles/gvimrc"
+# ifdef VMS
+#  define USR_GVIMRC_FILE2	"sys$login:vimfiles/gvimrc"
 # else
-#  ifdef VMS
-#   define USR_GVIMRC_FILE2	"sys$login:vimfiles/gvimrc"
-#  else
-#   define USR_GVIMRC_FILE2	"~/.vim/gvimrc"
-#  endif
+#  define USR_GVIMRC_FILE2	"~/.vim/gvimrc"
 # endif
 #endif
 
@@ -347,9 +333,6 @@
 #   define VIMINFO_FILE "$HOME/.viminfo"
 #  endif
 # endif
-# if !defined(VIMINFO_FILE2) && defined(OS2)
-#  define VIMINFO_FILE2 "$VIM/.viminfo"
-# endif
 # if !defined(VIMINFO_FILE2) && defined(VMS)
 #  define VIMINFO_FILE2 "sys$login:_viminfo"
 # endif
@@ -374,74 +357,51 @@
 #endif
 
 #ifndef DFLT_BDIR
-# ifdef OS2
-#  define DFLT_BDIR     ".,c:/tmp,~/tmp,~/"
+# ifdef VMS
+#  define DFLT_BDIR    "./,sys$login:,tmp:"
 # else
-#  ifdef VMS
-#   define DFLT_BDIR    "./,sys$login:,tmp:"
-#  else
-#   define DFLT_BDIR    ".,~/tmp,~/"    /* default for 'backupdir' */
-#  endif
+#  define DFLT_BDIR    ".,~/tmp,~/"    /* default for 'backupdir' */
 # endif
 #endif
 
 #ifndef DFLT_DIR
-# ifdef OS2
-#  define DFLT_DIR      ".,~/tmp,c:/tmp,/tmp"
+# ifdef VMS
+#  define DFLT_DIR     "./,sys$login:,tmp:"
 # else
-#  ifdef VMS
-#   define DFLT_DIR     "./,sys$login:,tmp:"
-#  else
-#   define DFLT_DIR     ".,~/tmp,/var/tmp,/tmp" /* default for 'directory' */
-#  endif
+#  define DFLT_DIR     ".,~/tmp,/var/tmp,/tmp" /* default for 'directory' */
 # endif
 #endif
 
 #ifndef DFLT_VDIR
-# ifdef OS2
-#  define DFLT_VDIR     "$VIM/vimfiles/view"
+# ifdef VMS
+#  define DFLT_VDIR    "sys$login:vimfiles/view"
 # else
-#  ifdef VMS
-#   define DFLT_VDIR    "sys$login:vimfiles/view"
-#  else
-#   define DFLT_VDIR    "$HOME/.vim/view"       /* default for 'viewdir' */
-#  endif
+#  define DFLT_VDIR    "$HOME/.vim/view"       /* default for 'viewdir' */
 # endif
 #endif
 
 #define DFLT_ERRORFILE		"errors.err"
 
-#ifdef OS2
-# define DFLT_RUNTIMEPATH	"$HOME/vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,$HOME/vimfiles/after"
+#ifdef VMS
+# define DFLT_RUNTIMEPATH      "sys$login:vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,sys$login:vimfiles/after"
 #else
-# ifdef VMS
-#  define DFLT_RUNTIMEPATH      "sys$login:vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,sys$login:vimfiles/after"
+# ifdef RUNTIME_GLOBAL
+#  define DFLT_RUNTIMEPATH	"~/.vim," RUNTIME_GLOBAL ",$VIMRUNTIME," RUNTIME_GLOBAL "/after,~/.vim/after"
 # else
-#  ifdef RUNTIME_GLOBAL
-#   define DFLT_RUNTIMEPATH	"~/.vim," RUNTIME_GLOBAL ",$VIMRUNTIME," RUNTIME_GLOBAL "/after,~/.vim/after"
-#  else
-#   define DFLT_RUNTIMEPATH	"~/.vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,~/.vim/after"
-#  endif
+#  define DFLT_RUNTIMEPATH	"~/.vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,~/.vim/after"
 # endif
 #endif
 
-#ifdef OS2
-/*
- * Try several directories to put the temp files.
- */
-# define TEMPDIRNAMES	"$TMP", "$TEMP", "c:\\TMP", "c:\\TEMP", ""
-# define TEMPNAMELEN	128
-#else
-# ifdef VMS
-#  ifndef VAX
-#   define VMS_TEMPNAM    /* to fix default .LIS extension */
-#  endif
-#  define TEMPNAME       "TMP:v?XXXXXX.txt"
-#  define TEMPNAMELEN    28
-# else
-#  define TEMPDIRNAMES  "$TMPDIR", "/tmp", ".", "$HOME"
-#  define TEMPNAMELEN    256
+#ifdef VMS
+# ifndef VAX
+#  define VMS_TEMPNAM    /* to fix default .LIS extension */
 # endif
+# define TEMPNAME       "TMP:v?XXXXXX.txt"
+# define TEMPNAMELEN    28
+#else
+/* Try several directories to put the temp files. */
+# define TEMPDIRNAMES  "$TMPDIR", "/tmp", ".", "$HOME"
+# define TEMPNAMELEN    256
 #endif
 
 /* Special wildcards that need to be handled by the shell */
diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index 23434ba..89dff77 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -30,7 +30,6 @@
 void mch_get_host_name __ARGS((char_u *s, int len));
 long mch_get_pid __ARGS((void));
 int mch_dirname __ARGS((char_u *buf, int len));
-void slash_adjust __ARGS((char_u *p));
 int mch_FullName __ARGS((char_u *fname, char_u *buf, int len, int force));
 int mch_isFullName __ARGS((char_u *fname));
 void fname_case __ARGS((char_u *name, int len));
diff --git a/src/term.c b/src/term.c
index b3201fe..89a234c 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2079,7 +2079,7 @@
 }
 # endif
 
-# if ((defined(UNIX) || defined(VMS) || defined(OS2)) \
+# if ((defined(UNIX) || defined(VMS)) \
 	&& defined(FEAT_MOUSE_TTY)) || defined(PROTO)
     void
 del_mouse_termcode(n)
@@ -2765,7 +2765,8 @@
 	OUT_STR(tgoto((char *)s, 0, n));
 }
 
-#if (defined(FEAT_TITLE) && (defined(UNIX) || defined(OS2) || defined(VMS) || defined(MACOS_X))) || defined(PROTO)
+#if (defined(FEAT_TITLE) && (defined(UNIX) || defined(VMS) \
+	|| defined(MACOS_X))) || defined(PROTO)
 /*
  * Generic function to set window title, using t_ts and t_fs.
  */
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
deleted file mode 100644
index 828d354..0000000
--- a/src/testdir/Make_os2.mak
+++ /dev/null
@@ -1,67 +0,0 @@
-#
-# Makefile to run all tests for Vim, on OS/2
-#
-# OUTDATED, probably doesn't work.
-#
-# Requires a set of Unix tools: echo, diff, etc.
-#
-
-VIMPROG = ../vim.exe
-
-default: all
-
-include Make_all.mak
-
-# Omitted:
-# test2		"\\tmp" doesn't work.
-# test10	'errorformat' is different
-# test11	requires sed
-# test12	can't unlink a swap file
-# test25	uses symbolic link
-# test27	can't edit file with "*" in file name
-# test52	only for Win32
-# test85	no Lua interface
-# test86, 87	no Python interface
-# test97	\{ and \$ are not escaped characters.
-
-SCRIPTS = $(SCRIPTS_ALL) $(SCRIPTS_MORE3) $(SCRIPTS_MORE4)
-
-SCRIPTS_BENCH = bench_re_freeze.out
-
-.SUFFIXES: .in .out
-
-all:	/tmp $(SCRIPTS_FIRST) $(SCRIPTS)
-	@echo ALL DONE
-
-$(SCRIPTS_FIRST) $(SCRIPTS): $(VIMPROG)
-
-# Must run test1 first to create small.vim.
-$(SCRIPTS): $(SCRIPTS_FIRST)
-
-benchmark: $(SCRIPTS_BENCH)
-
-clean:
-	-rm -rf *.out Xdotest test.ok tiny.vim small.vim mbyte.vim viminfo
-
-# Make sure all .in and .out files are in DOS fileformat.
-.in.out:
-	$(VIMPROG) -u NONE -s todos.vim $*.in
-	$(VIMPROG) -u NONE -s todos.vim $*.ok
-	copy $*.ok test.ok
-	$(VIMPROG) -u os2.vim --noplugin -s dotest.in $*.in
-	$(VIMPROG) -u NONE -s todos.vim test.out
-	diff test.out $*.ok
-	rename test.out $*.out
-	-rm -rf X* viminfo
-	-del test.ok
-
-# Create a directory for temp files
-/tmp:
-	-mkdir /tmp
-
-bench_re_freeze.out: bench_re_freeze.vim
-	-del $*.failed test.ok benchmark.out
-	copy $*.ok test.ok
-	$(VIMPROG) -u os2.vim --noplugin -s dotest.in $*.in
-	type benchmark.out
-
diff --git a/src/testdir/os2.vim b/src/testdir/os2.vim
deleted file mode 100644
index c97ba5d..0000000
--- a/src/testdir/os2.vim
+++ /dev/null
@@ -1,3 +0,0 @@
-" Settings for test script execution
-" Always use "CMD.EXE", don't use the value of "$SHELL".
-set shell=CMD.EXE shellquote= shellxquote= shellcmdflag=/c shellredir=>
diff --git a/src/ui.c b/src/ui.c
index 5438a38..f622f04 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -1772,7 +1772,7 @@
 fill_input_buf(exit_on_error)
     int	exit_on_error UNUSED;
 {
-#if defined(UNIX) || defined(OS2) || defined(VMS) || defined(MACOS_X_UNIX)
+#if defined(UNIX) || defined(VMS) || defined(MACOS_X_UNIX)
     int		len;
     int		try;
     static int	did_read_something = FALSE;
@@ -1796,7 +1796,7 @@
 	return;
     }
 #endif
-#if defined(UNIX) || defined(OS2) || defined(VMS) || defined(MACOS_X_UNIX)
+#if defined(UNIX) || defined(VMS) || defined(MACOS_X_UNIX)
     if (vim_is_input_buf_full())
 	return;
     /*
@@ -1940,9 +1940,9 @@
 	    ++inbufcount;
 	}
     }
-#endif /* UNIX or OS2 or VMS*/
+#endif /* UNIX or VMS*/
 }
-#endif /* defined(UNIX) || defined(FEAT_GUI) || defined(OS2)  || defined(VMS) */
+#endif /* defined(UNIX) || defined(FEAT_GUI) || defined(VMS) */
 
 /*
  * Exit because of an input read error.
diff --git a/src/version.c b/src/version.c
index 089546f..f074fb3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1008,
+/**/
     1007,
 /**/
     1006,
diff --git a/src/vim.h b/src/vim.h
index 11b9119..ac3a883 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1682,7 +1682,7 @@
 # endif
 #endif
 
-#if defined(UNIX) || defined(FEAT_GUI) || defined(OS2) || defined(VMS) \
+#if defined(UNIX) || defined(FEAT_GUI) || defined(VMS) \
 	|| defined(FEAT_CLIENTSERVER)
 # define USE_INPUT_BUF
 #endif
@@ -2237,7 +2237,7 @@
 /* values for vim_handle_signal() that are not a signal */
 #define SIGNAL_BLOCK	-1
 #define SIGNAL_UNBLOCK  -2
-#if !defined(UNIX) && !defined(VMS) && !defined(OS2)
+#if !defined(UNIX) && !defined(VMS)
 # define vim_handle_signal(x) 0
 #endif
 
diff --git a/src/window.c b/src/window.c
index 613cc5f..95515b5 100644
--- a/src/window.c
+++ b/src/window.c
@@ -6531,7 +6531,7 @@
 	/* something failed; use the file name (truncate when too long) */
 	vim_strncpy(buf, fname, len - 1);
     }
-#if defined(MACOS_CLASSIC) || defined(OS2) || defined(MSDOS) || defined(MSWIN)
+#if defined(MACOS_CLASSIC) || defined(MSDOS) || defined(MSWIN)
     slash_adjust(buf);
 #endif
     return retval;