Can't find w32pthreads.h in Windows

[rafi4135]

I am trying to build master branch in windows. Built and installed ffmpeg from source. But when I run make for Comskip, this error comes:

In file included from comskip.c:16: platform.h:78:10: fatal error: compat/w32pthreads.h: No such file or directory

I went in "/usr/local/include" folder, and didn't find "compat/w32pthreads.h". How can I solve this?