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Due to our use of `libtool' to generate and install the FreeType 2
libraries on Unix systems, as well as other historical events, it is
generally very difficult to know precisely which release of the font
engine is installed on a given system.
This file tries to explain why and to document ways to properly detect
FreeType on Unix.
1. Version and Release numbers
For each new public release of FreeType 2, there are generally *three*
distinct `version' numbers to consider:
* The official FreeType 2 release number, like 2.7.0 or 2.10.2.
* The libtool (and Unix) specific version number, like 23.2.17.
This is what
pkg-config freetype2 --modversion
freetype-config --version
* The platform-specific shared object number, used for example when
the library is installed as `/usr/lib/'.
The platform-specific number is, unsurprisingly, platform-specific and
varies with the operating system you are using (several variants of
Linux, FreeBSD, Solaris, etc.). You should thus _never_ use it, even
for simple tests.
The libtool-specific number does not equal the release number but is
tied to it.
The release number is available at *compile* time through the
following macros defined in `freetype.h':
- FREETYPE_MAJOR: major release number
- FREETYPE_MINOR: minor release number
- FREETYPE_PATCH: patch release number
See below for a small autoconf fragment.
The release number is also available at *runtime* through the
`FT_Library_Version' API.
2. History
The following table gives, for all releases since 2.5.0, the
corresponding libtool number, as well as the shared object number
found on _most_ systems, but not all of them:
release libtool so
2.10.2 23.2.17 6.17.2
2.10.1 23.1.17 6.17.1
2.10.0 23.0.17 6.17.0
2.9.1 22.1.16 6.16.1
2.9.0 22.0.16 6.16.0
2.8.1 21.0.15 6.15.0
2.8.0 20.0.14 6.14.0
2.7.1 19.0.13 6.13.0
2.7.0 18.6.12 6.12.6
2.6.5 18.5.12 6.12.5
2.6.4 18.4.12 6.12.4
2.6.3 18.3.12 6.12.3
2.6.2 18.2.12 6.12.2
2.6.1 18.1.12 6.12.1
2.6.0 18.0.12 6.12.0
2.5.5 17.4.11 6.11.4
2.5.4 17.3.11 6.11.3
2.5.3 17.2.11 6.11.2
2.5.2 17.1.11 6.11.1
2.5.1 17.0.11 6.11.0
2.5.0 16.2.10 6.10.2
3. Autoconf Code Fragment
Lars Clausen contributed the following autoconf fragment to check
which version of FreeType is installed on a system (now updated to use
`pkg-config' instead of `freetype-config'). This one tests for a
version that is at least 2.10.2; you should change it to check against
other release numbers.
AC_MSG_CHECKING([whether FreeType version is 2.10.2 or higher])
CPPFLAGS=`pkg-config freetype2 --cflags`
#include <ft2build.h>
#include <freetype/freetype.h>
# error FreeType version too low.
FREETYPE_LIBS=`pkg-config freetype2 --libs`
AC_DEFINE(HAVE_FREETYPE,1,[Define if you have the FreeType2 library])
[AC_MSG_ERROR([Need FreeType library version 2.10.2 or higher])])
Copyright (C) 2002-2020 by
David Turner, Robert Wilhelm, and Werner Lemberg.
This file is part of the FreeType project, and may only be used,
modified, and distributed under the terms of the FreeType project
license, LICENSE.TXT. By continuing to use, modify, or distribute
this file you indicate that you have read the license and understand
and accept it fully.
--- end of VERSIONS.TXT ---