transcode: 1.0.5_3 => 1.0.6_1 fails at configure(gnome-config)

[Henry Hu]

In my config.log, I found that there is -pthread in the arguments.
It comes from $LIBAVCODEC_EXTRA_LIBS, which comes from `pkg-config --libs
libavcodec`

$ pkg-config --libs libavcodec
-pthread -L/usr/local/lib -lavcodec -lz -la52 -lfaac -lfaad -lmp3lame -lx264
-lxvidcore -ltheora -lvorbisenc -lavutil -lvorbis -lm -logg

So it is present when libavcodec(ffmpeg) is installed.
So why is it missing in your libavcodec's pkgconfig file?