$cd ffmpeg/
$ ./configure  --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass \
> --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus \
> --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
gcc is unable to create an executable file.
If gcc is a cross-compiler, use the --enable-cross-compile option.
Only do this if you know what cross compiling means.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.