/usr/bin/ld: warning: libavutil.so.51, needed by /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so, not found (try using -rpath or -rpath-link)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_log_get_level@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_mallocz@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_get_picture_type_char@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_sha_init@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_pix_fmt_descriptors@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_log_set_level@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_set_int@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_sha_final@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_malloc@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_freep@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_sha_size@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `avutil_version@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_sha_update@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_reduce@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_get_bits_per_sample_fmt@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_get_pix_fmt@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_get_pix_fmt_name@LIBAVUTIL_51'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/libffms2.so: undefined reference to `av_free@LIBAVUTIL_51'
collect2: error: ld returned 1 exit status
make[1]: *** [aegisub-3.0] error 1
make[1]: leaving directory `~/rebuild/aegisub/src/aegisub/aegisub/src'
make: *** [src] error 2