Something

g++ -I../stream -I../loader -I../libavutil -I../libavcodec -I../libavformat -I. -I.. -O4 -march=i486 -mcpu=i686 -pipe -ffast-math -fomit-frame-pointer -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -I/usr/local/include/freetype2 -I/usr/local/include -I/usr/lib/live/liveMedia/include                   -I/usr/lib/live/UsageEnvironment/include                   -I/usr/lib/live/BasicUsageEnvironment/include                   -I/usr/lib/live/groupsock/include -D__STDC_LIMIT_MACROS   -c -o demux_rtp.o demux_rtp.cpp
In file included from demux_rtp.h:8,
                 from demux_rtp.cpp:9:
../stream/stream.h: In function `int stream_read_char(stream_t*)':
../stream/stream.h:131: `stream_fill_buffer' undeclared (first use this 
   function)
../stream/stream.h:131: (Each undeclared identifier is reported only once for 
   each function it appears in.)
../stream/stream.h: In function `int stream_seek(stream_t*, long int)':
../stream/stream.h:269: `stream_seek_long' undeclared (first use this function)
make[1]: *** [demux_rtp.o] Error 1
make[1]: Leaving directory `/d/mplayer-testclips/mplayer/libmpdemux'
make: *** [libmpdemux/libmpdemux.a] Error 2