Yet I have it here:
address@hidden linphone-desktop]# find / -name 'frame.h' | grep libavutil
/usr/src/debug/ffmpeg-2.6.8/libavutil/frame.h
/usr/include/ffmpeg/libavutil/frame.h
/opt/Qt/5.10.1/Src/qtwebengine/src/3rdparty/chromium/third_party/ffmpeg/libavutil/frame.h
address@hidden linphone-desktop]#
Do I need to tell linphone where the source files are?