make -C libavutil   install-libs
make[1]: Entering directory `/usr/src/RPM/BUILD/ffmpeg-0.5.0/libavutil'
install -d "/usr/src/tmp/ffmpeg-buildroot/usr/lib"
install -s -m 755 libavutil.so \
                /usr/lib/libavutil.so.49.0.0
install: cannot create regular file `/usr/lib/libavutil.so.49.0.0': Permission denied
make[1]: *** [install-lib-shared] Error 1