Couldn't build ffmpeg

[vexonelite]

Hi, recently, I came across your Github, and clone the project, but I encountered building error:
Couldn't build ffmpeg!

I saw the build.log, and noticed the following error message:
arm-linux-androideabi-gcc: error: libavutil/.compat/strtod.c: No such file or directory
arm-linux-androideabi-gcc: fatal error: no input files
compilation terminated.
make: *** [libavutil/../compat/strtod.o] Error 1

Can you give me some idea how to fix such error, thank you