This is on 

- 64-bit Windows

- Msys+mingw64 GCC compilation suite

- ccl and/or sbcl (latest Windows version)

- cffi 0.16.1.

I had problems loading cffi-libffi:

- CCL did fine

- SBCL barfed during the grovel phase:

  > Paths returned by pkg-config had a control-M appended to the end

I fixed that by adding \#Return to the list of characters trimmed by cffi-grovel::trim-whitespaces.

With that addition both SBCL and CCL loaded cffi-libffi.

Mirko