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 “ffbuild/config.log” produced by configure as this will help
solve the problem.
网上搜了很多资料，都不行。其实最基本的办法还是按上面报错信息里面说的，进入ffbuild/config.log，查看文件最后的报错信息。
我根据项目用./configure --enable-opengl --extra-libs=‘-lGL -lGLU -lGLEW -lglfw -lpng -lm -lz’进行编译，结果config.log里面表示找不到lGLEW，那么我们首先去掉lGLEW，用./configure --enable-opengl --extra-libs=’-lGL -lGLU -lglfw -lpng -lm -lz’进行编译即可。等编译完成了，再加上 -lGLU重新编译。

之后果然不报错了。