How to check ffmpeg's version and enabled flags in caspercg

I want to know how ffmpeg was compiled to work with casper cg. As I want SRT in caspercg I am trying to compile ffmpeg with srt with dlls. If I am not wrong caspercg is using 4.3 build version of ffmeg. Is there a right way to enable srt?? if so how would I add srt to caspercg what would be the procedure?. I am some what to caspercg.

I want to know the flags so that I can compile ffmpeg just the way it is in caspercg + --enable-libsrt.