diff --git a/ChangeLog b/ChangeLog
index bac8e47..c273f09 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+1999-08-25  Paul D. Smith  <psmith@gnu.org>
+
+	* Version 3.77.94 released.
+
+	* main.c (main) [__MSDOS__]: If the user uses -j, warn that it's
+	not supported and reset it.
+
+	* make.h (ISDIGIT): Obtained this from the textutils distribution.
+	* main.c (decode_switches): Use it.
+	* function.c (is_numeric): Use it.
+
+	* main.c (struct command_switch): Store the switch char in an
+	unsigned char to shut up GCC about using it with ctype.h macros.
+	Besides, it _is_ always unsigned.
+
 1999-08-24  Paul D. Smith  <psmith@gnu.org>
 
 	* make.texinfo: Change "dependency" to "prerequisite" and
@@ -13,8 +28,8 @@
 
 	* remake.c (update_file): Move the considered check into the
 	double-colon rule loop, so we consider double-colon rules
-	individually (otherwise after the first is pruned, the rest might
-	not get run).
+	individually (otherwise after the first is pruned, the rest won't
+	get run).
 
 	* README.template: Minor changes.
 
diff --git a/function.c b/function.c
index 0e619fd..0acfd7e 100644
--- a/function.c
+++ b/function.c
@@ -702,13 +702,10 @@
   char *end = p + strlen (p) - 1;
   char *beg = p;
   strip_whitespace (&p, &end);
-  while (p <= end)
-    {
-      if (!isdigit (*p))
-	return 0;
 
-      p++;
-    }
+  while (p <= end)
+    if (!ISDIGIT (*(p++)))  /* ISDIGIT only evals its arg once: see make.h.  */
+      return 0;
 
   return (end - beg >= 0);
 }
diff --git a/main.c b/main.c
index de82b59..0035a1d 100644
--- a/main.c
+++ b/main.c
@@ -79,7 +79,7 @@
 
 struct command_switch
   {
-    char c;			/* The switch character.  */
+    unsigned char c;		/* The switch character.  */
 
     enum			/* Type of the value.  */
       {
@@ -1270,7 +1270,7 @@
   /* We need to know what kind of shell we will be using.  */
   {
     extern int _is_unixy_shell (const char *_path);
-    struct variable *shv = lookup_variable("SHELL", 5);
+    struct variable *shv = lookup_variable ("SHELL", 5);
     extern int unixy_shell;
     extern char *default_shell;
 
@@ -1294,6 +1294,15 @@
   decode_env_switches ("MFLAGS", 6);
 #endif
 
+#ifdef __MSDOS__
+  if (job_slots != 1)
+    {
+      error (NILF, _("Parallel jobs (-j) are not supported on MS-DOS."));
+      error (NILF, _("Resetting to single job mode."));
+      job_slots = 1;
+    }
+#endif
+
 #ifdef MAKE_JOBSERVER
   /* If the jobserver-fds option is seen, make sure that -j is reasonable.  */
 
@@ -1851,8 +1860,7 @@
 	}
       else
 	{
-	  lastgoal->next
-	    = (struct dep *) xmalloc (sizeof (struct dep));
+	  lastgoal->next = (struct dep *) xmalloc (sizeof (struct dep));
 	  lastgoal = lastgoal->next;
 	}
       lastgoal->name = 0;
@@ -2075,7 +2083,7 @@
 
 		case positive_int:
 		  if (optarg == 0 && argc > optind
-		      && isdigit (argv[optind][0]))
+		      && ISDIGIT (argv[optind][0]))
 		    optarg = argv[optind++];
 
 		  if (!doit)
@@ -2087,8 +2095,7 @@
 		      if (i < 1)
 			{
 			  if (doit)
-			    error (NILF, _("the `-%c' option requires a \
-positive integral argument"),
+			    error (NILF, _("the `-%c' option requires a positive integral argument"),
 				   cs->c);
 			  bad = 1;
 			}
@@ -2103,7 +2110,7 @@
 #ifndef NO_FLOAT
 		case floating:
 		  if (optarg == 0 && optind < argc
-		      && (isdigit (argv[optind][0]) || argv[optind][0] == '.'))
+		      && (ISDIGIT (argv[optind][0]) || argv[optind][0] == '.'))
 		    optarg = argv[optind++];
 
 		  if (doit)
diff --git a/make.h b/make.h
index b25318b..a50334f 100644
--- a/make.h
+++ b/make.h
@@ -299,6 +299,17 @@
 # endif /* HAVE_ALLOCA_H.  */
 #endif /* GCC.  */
 
+/* ISDIGIT offers the following features:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char.
+   - It's guaranteed to evaluate its argument exactly once.
+      NOTE!  Make relies on this behavior, don't change it!
+   - It's typically faster.
+   Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
+   only '0' through '9' are digits.  Prefer ISDIGIT to isdigit() unless
+   it's important to use the locale's definition of `digit' even when the
+   host does not conform to Posix.  */
+#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
+
 #ifndef iAPX286
 # define streq(a, b) \
    ((a) == (b) || \
diff --git a/variable.c b/variable.c
index 97207f1..377daf5 100644
--- a/variable.c
+++ b/variable.c
@@ -954,7 +954,7 @@
      register struct variable *v;
      char *prefix;
 {
-  char *origin;
+  const char *origin;
 
   switch (v->origin)
     {
@@ -982,7 +982,6 @@
     case o_invalid:
     default:
       abort ();
-      break;
     }
   printf ("# %s\n", origin);