[FFmpeg-user] Configure error with fontconfig

[Jim Worrall]

> On Apr 30, 2024, at 09:41, Jim Worrall <coniophora at gmail.com> wrote:
> 
> 
> 
>> On Apr 29, 2024, at 23:00, Ferdi Scholten <ferdi at sttc-nlp.nl> wrote:
>> 
>> This may not be due to ffmpeg itself, but I would appreciate some help.
>>> Configure says that pkg-config can’t find fontconfig.pc, but it seems to be
>>> in the PKG_CONFIG_PATH.
>>> 
>>> # ./configure --cc=/usr/bin/gcc \
>>> --prefix=$TARGET \
>>> --pkg-config-flags="--static" \
>>> --extra-cflags="-I/usr/local/include" \
>>> --extra-ldflags="-L/usr/local/lib" \
>>> --extra-libs="-lpthread -ldl -lstdc++" \
>>> --enable-static --disable-shared \
>>> --enable-nonfree --enable-gpl --enable-version3 \
>>> --enable-libfribidi --enable-libfreetype --enable-libfontconfig \
>>> --enable-libfdk-aac --enable-libx264 --enable-libx265 --disable-lzma
>>> ERROR: fontconfig not found using pkg-config
>>> 
>>> ffbuild/config.log:
>>> . . .
>>> require_pkg_config libfontconfig fontconfig fontconfig/fontconfig.h FcInit
>>> check_pkg_config libfontconfig fontconfig fontconfig/fontconfig.h FcInit
>>> test_pkg_config libfontconfig fontconfig fontconfig/fontconfig.h FcInit
>>> pkg-config --exists --print-errors fontconfig
>>> Package fontconfig was not found in the pkg-config search path.
>>> Perhaps you should add the directory containing `fontconfig.pc'
>>> to the PKG_CONFIG_PATH environment variable
>>> Package 'fontconfig', required by 'virtual:world', not found
>>> ERROR: fontconfig not found using pkg-config
>>> 
>>> Here is fontconfig.pc:
>>> # ll /usr/local/ffmpeg/packages/pkg-config/check/gtk/
>>> total 224K
>>> drwxr-xr-x 2 root root  28 Apr 28 11:14 ./
>>> drwxr-xr-x 7 root root  72 Apr 28 11:14 ../
>>> -rw-r--r-- 1 root root 232 Apr 28 11:14 atk.pc
>>> -rw-r--r-- 1 root root 287 Apr 28 11:14 cairo-gobject.pc
>>> -rw-r--r-- 1 root root 388 Apr 28 11:14 cairo.pc
>>> -rw-r--r-- 1 root root 269 Apr 28 11:14 fontconfig.pc
>>> 
>>> The last path in PKG_CONFIG_PATH contains fontconfig.pc:
>>> 
>>> # echo $PKG_CONFIG_PATH
>>> /lib:/usr/lib:usr/local:/usr/local/lib:/usr/local/lib/pkgconfig:
>>> /usr/libdata/pkgconfig:/usr/local/libdata/:/usr/local/libdata/pkgconfig:
>>> /usr/local/ffmpeg/target/lib:/usr/local/ffmpeg/target/lib/pkgconfig:
>>> /usr/local/ffmpeg/target/share/pkgconfig:
>>> /usr/local/ffmpeg/build/pkg-config/check/gtk/
>>> _______________________________________________
>> 
>> Most likely the fontconfig package on your system is a shared library, it is not distributed as a static library. It therefor cannot be used in a static build with --disable-shared.
>> 
>> 
>> Try building ffmpeg with shared libraries if you need fontconfig.
> 
> Thank you.  Before changing all the ffmpeg dependencies to shared libraries, 
> I tried making a static fontconfig.  I removed the packaged fontconfig parts 
> and built my own static fontconfig, but got the same “fontconfig not found" error.  
> There is no .so file on the system with *fontconfig* in its name.
> 
> The relevant files may be:
> /usr/local/ffmpeg/target/include/fontconfig/fontconfig.h
> /usr/local/ffmpeg/target/lib/libfontconfig.la <http://libfontconfig.la/>
> /usr/local/ffmpeg/target/lib/pkgconfig/fontconfig.pc
> /usr/local/ffmpeg/target/lib/libfontconfig.a
> 
> 
> 
> fontconfig.pc contains:
> # cat /usr/local/ffmpeg/target/lib/pkgconfig/fontconfig.pc
> prefix=/usr/local/ffmpeg/target
> exec_prefix=${prefix}
> libdir=${exec_prefix}/lib
> includedir=${prefix}/include
> sysconfdir=${prefix}/etc
> localstatedir=${prefix}/var
> PACKAGE=fontconfig
> confdir=${sysconfdir}/fonts
> cachedir=${localstatedir}/cache/${PACKAGE}
> 
> Name: Fontconfig
> Description: Font configuration and customization library
> Version: 2.15.0
> Requires:  freetype2 >= 21.0.15
> Requires.private:  libxml-2.0 >= 2.6
> Libs: -L${libdir} -lfontconfig
> Libs.private:  
> Cflags: -I${includedir}  
> 
> fontconfig.pc seems to be pointing to the right places (except sysconfdir=${prefix}/etc doesn’t exist; I don’t know what it would be looking for there).  I’m perplexed.

Small error; ${prefix}/etc DOES exist.  It contains a fonts directory.