Hi, I am trying to upgrade ffmpeg from 0.4.9-pre1_1 to 0.4.9-pre1_2 and I am getting in return: make -C libavformat all gcc -dynamiclib -Wl,-single_module -Wl,-install_name,/opt/local/lib/libavformat.dylib,-current_version,51.1.0,-compatibility_version,51.1.0 -Wl,-read_only_relocs,suppress -Wl,-dynamic,-search_paths_first -L/opt/local/lib -o libavformat.51.dylib utils.o cutils.o os_support.o allformats.o framehook.o avio.o aviobuf.o raw.o adtsenc.o aiff.o riff.o amr.o apc.o asf.o asf-enc.o au.o avidec.o avienc.o avs.o vocdec.o voc.o bethsoftvid.o c93.o crc.o daud.o dsicin.o dv.o dvenc.o dxa.o electronicarts.o ffm.o flic.o flvdec.o flvenc.o 4xm.o gif.o gifdec.o gxf.o gxfenc.o idcin.o img2.o ipmovie.o matroska.o mm.o mmf.o mov.o isom.o movenc.o mp3.o mpc.o mpeg.o mpegts.o mpegtsenc.o mpjpeg.o mtv.o mxf.o nsvdec.o nutdec.o nuv.o ogg2.o oggparsevorbis.o oggparsetheora.o oggparseflac.o oggparseogm.o ogg.o rtsp.o rm.o idroq.o rtp.o rtp_h264.o segafilm.o smacker.o sol.o psxstr.o swf.o thp.o tiertexseq.o tta.o txd.o sierravmd.o vocenc.o wav.o wc3movie.o westwood.o wv.o yuv4mpeg.o file.o http.o rtpproto.o tcp.o udp.o -L"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg/work/trunk"/libavutil -lavutil -lavcodec -L"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg/work/trunk"/libavcodec -lz -logg -lxvidcore -lx264 -lfaac ld: Undefined symbols: _ff_mpa_decode_header /usr/bin/libtool: internal link edit command failed make[1]: *** [libavformat.51.dylib] Error 1 make: *** [lib] Error 2 Any idea what is the cause of this? Thanks in advance, Stefan