./configure --target-os=mingw32 --arch=x86 --cross-prefix=i686-pc-mingw32- --extra-ldflags=-static --enable-libmp3lame --enable-libxvid --enable-gpl --enable-nonfree --enable-version3 --prefix=/ffmpeg-win32/o2 --enable-pthreads --pkg-config=pkg-config

.
.
.

check_lib xvid.h xvid_global -lxvidcore
check_header xvid.h
check_cpp
BEGIN /tmp/ffconf.jtyF5qeA.c
    1	#include <xvid.h>
    2	int x;
END /tmp/ffconf.jtyF5qeA.c
i686-pc-mingw32-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -std=c99 -fno-common -fomit-frame-pointer -E -o /tmp/ffconf.fCjYMqe7.o /tmp/ffconf.jtyF5qeA.c
check_func xvid_global -lxvidcore
check_ld cc -lxvidcore
check_cc
BEGIN /tmp/ffconf.jtyF5qeA.c
    1	extern int xvid_global();
    2	int main(void){ xvid_global(); }
END /tmp/ffconf.jtyF5qeA.c
i686-pc-mingw32-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -std=c99 -fno-common -fomit-frame-pointer -c -o /tmp/ffconf.fCjYMqe7.o /tmp/ffconf.jtyF5qeA.c
i686-pc-mingw32-gcc -static -Wl,--as-needed -o /tmp/ffconf.DpEuAfWN.exe /tmp/ffconf.fCjYMqe7.o -lxvidcore -lmp3lame -lm -lpthread -lbz2 -lz -lpsapi
/usr/lib/gcc/i686-pc-mingw32/4.5.2/../../../../i686-pc-mingw32/bin/ld: cannot find -lxvidcore
collect2: ld returned 1 exit status
ERROR: libxvid not found