[racket] Building Racket on windows: missing ffi.h

From: Sergey Khorev (sergey.khorev at gmail.com)
Date: Mon Oct 3 12:45:28 EDT 2011

> It should be in "src/worksp/libffi", but I see that "src/worksp/libffi"
> is missing in the Windows source distribution. We'll fix the
> distribution specs.

Thanks Matthew.

Looking into git repo, I see more files are missing: build.bat,
rbuildmode.c and sgc directory.

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