[FFmpeg-user] avi file "operation not permitted"

[Jon Drukman]

/usr/local/bin/ffmpeg -loglevel quiet -v 0 -i list.avi -s 480x352 -an -pass 1
-vcodec libx264 -vpre fast_firstpass -b 300k -bt 300k -threads 0 list.avi.mp4

ffmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
   built on May  5 2011 11:01:27 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
--enable-libx264 --enable-pthreads --enable-static --disable-shared
--disable-network --enable-nonfree
   libavutil    51.  2. 0 / 51.  2. 0
   libavcodec   53.  3. 0 / 53.  3. 0
   libavformat  53.  0. 3 / 53.  0. 3
   libavdevice  53.  0. 0 / 53.  0. 0
   libavfilter   2.  4. 0 /  2.  4. 0
   libswscale    0. 14. 0 /  0. 14. 0
list.avi: Operation not permitted

What does it mean?  I built ffmpeg from source this morning using last night's
tarball/snapshot.