first commit

ffmpeg/lib/pkgconfig/libavcodec.pc

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+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavcodec
+Description: FFmpeg codec library
+Version: 58.91.100
+Requires: 
+Requires.private: libswresample >= 3.7.100, libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lavcodec 
+Libs.private: -pthread -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libavdevice.pc

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+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavdevice
+Description: FFmpeg device handling library
+Version: 58.10.100
+Requires: 
+Requires.private: libavfilter >= 7.85.100, libswscale >= 5.7.100, libavformat >= 58.45.100, libavcodec >= 58.91.100, libswresample >= 3.7.100, libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lavdevice 
+Libs.private: -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libavfilter.pc

@@ -0,0 +1,14 @@
+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavfilter
+Description: FFmpeg audio/video filtering library
+Version: 7.85.100
+Requires: 
+Requires.private: libswscale >= 5.7.100, libavformat >= 58.45.100, libavcodec >= 58.91.100, libswresample >= 3.7.100, libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lavfilter 
+Libs.private: -pthread -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libavformat.pc

@@ -0,0 +1,14 @@
+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavformat
+Description: FFmpeg container format library
+Version: 58.45.100
+Requires: 
+Requires.private: libavcodec >= 58.91.100, libswresample >= 3.7.100, libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lavformat 
+Libs.private: -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libavutil.pc

@@ -0,0 +1,14 @@
+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libavutil
+Description: FFmpeg utility library
+Version: 56.51.100
+Requires: 
+Requires.private: 
+Conflicts:
+Libs: -L${libdir}  -lavutil 
+Libs.private: -pthread -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libswresample.pc

@@ -0,0 +1,14 @@
+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libswresample
+Description: FFmpeg audio resampling library
+Version: 3.7.100
+Requires: 
+Requires.private: libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lswresample 
+Libs.private: -lm
+Cflags: -I${includedir}

ffmpeg/lib/pkgconfig/libswscale.pc

@@ -0,0 +1,14 @@
+prefix=./output
+exec_prefix=${prefix}
+libdir=./output/lib
+includedir=./output/include
+
+Name: libswscale
+Description: FFmpeg image rescaling library
+Version: 5.7.100
+Requires: 
+Requires.private: libavutil >= 56.51.100
+Conflicts:
+Libs: -L${libdir}  -lswscale 
+Libs.private: -lm
+Cflags: -I${includedir}