The generated .pc files have hardcoded references to prefix instead of ${prefix}

Hi, after building a gstreamer 1.20 distribution for centos7, the generated build is not relocatable, because of some hardcoded path references in pkg-config files.

What i do is run pkg-config --libs gstreamer-webrtc-1.0 --cflags --define-variable=prefix=/myprefix (where myprefix corresponds to the installed location on the client machine (please correct me if this is the wrong usage)

Unfortunately this results in things like -I/usr/local/gstreamer-1.0/include/orc-0.4, which are the paths i used when building the tarball on the build machine.

In short: not all .pc files have a variable prefix resulting in non-relocatable builds

Thanks

Update: 20221104

Based on gstreamer-1.0 linux packaging with cerbero

includedir:

• libavformat
• taglib_c
• libavfilter
• libavutil
• taglib
• libswresample
• libavcodec
• orc 0.4.31 -> 0.4.33
• freetype2
• pango
• pangocairo
• pangoft2
• x264

libdir

• dvdnav
• dvdread
• expat
• flac
• gobject-introspection-1.0
• gobject-introspection-no-export-1.0
• libass
• libavcodec
• libavfilter
• libavformat
• libavutil
• libcroco-0.6
• libdca
• libdts
• libjpeg
• libmpg123
• libpng16
• librsvg-2.0
• librtmp
• libswresample
• libtiff-4
• libturbojpeg
• libunwind
• libunwind-coredump
• libunwind-generic
• libunwind-ptrace
• libunwind-setjmp
• libxml-2.0
• ogg
• opencore-amrnb
• opencore-amrwb
• sbc
• spandsp
• speex
• taglib
• taglib_c
• theora
• theoradec
• theoraenc
• vo-aacenc
• vorbis
• vorbisenc
• vorbisfile
• x264
• zbar