[...]
Making all in ffmpeg
make[3]: Entering directory `/tmp/gst-ffmpeg-0.8.3/ext/ffmpeg'
if /bin/sh ../../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I../..   
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pthread
-I/usr/local/include/gstreamer-0.8 -I/usr/local/include/glib-2.0
-I/usr/local/lib/glib-2.0/include -I/usr/local/include/libxml2   -I
../../gst-libs/ext/ffmpeg/libavformat -I ../../gst-libs/ext/ffmpeg/libavcodec -s
-O3 -march=i686 -I/usr/local/include/libgnome-2.0
-I/usr/local/include/libgnome-2.0 -MT libgstffmpeg_la-gstffmpeg.lo -MD -MP -MF
".deps/libgstffmpeg_la-gstffmpeg.Tpo" -c -o libgstffmpeg_la-gstffmpeg.lo `test
-f 'gstffmpeg.c' || echo './'`gstffmpeg.c; \
then mv -f ".deps/libgstffmpeg_la-gstffmpeg.Tpo"
".deps/libgstffmpeg_la-gstffmpeg.Plo"; else rm -f
".deps/libgstffmpeg_la-gstffmpeg.Tpo"; exit 1; fi
 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-pthread -I/usr/local/include/gstreamer-0.8 -I/usr/local/include/glib-2.0
-I/usr/local/lib/glib-2.0/include -I/usr/local/include/libxml2 -I
../../gst-libs/ext/ffmpeg/libavformat -I ../../gst-libs/ext/ffmpeg/libavcodec -s
-O3 -march=i686 -I/usr/local/include/libgnome-2.0
-I/usr/local/include/libgnome-2.0 -MT libgstffmpeg_la-gstffmpeg.lo -MD -MP -MF
.deps/libgstffmpeg_la-gstffmpeg.Tpo -c gstffmpeg.c  -fPIC -DPIC -o
.libs/libgstffmpeg_la-gstffmpeg.o
gstffmpeg.c:63:3: attempt to use poisoned "gst_debug_log_valist"
gstffmpeg.c: In function `gst_ffmpeg_log_callback':
gstffmpeg.c:63: error: `ffmpeg_debug' undeclared (first use in this function)
gstffmpeg.c:63: error: (Each undeclared identifier is reported only once
gstffmpeg.c:63: error: for each function it appears in.)
make[3]: *** [libgstffmpeg_la-gstffmpeg.lo] Error 1
make[3]: Leaving directory `/tmp/gst-ffmpeg-0.8.3/ext/ffmpeg'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/tmp/gst-ffmpeg-0.8.3/ext'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/gst-ffmpeg-0.8.3'
make: *** [all] Error 2