Hi Bob,

I remember a similar issue being fixed by telling pkg-config how to find
libffi, using:

export PKG_CONFIG_PATH=/usr/local/opt/libffi/lib/pkgconfig

Simply running “pkg-config --modversion gtk+-2.0” may not raise an
error: you should also try to run “pkg-config --cflags gtk+-2.0”.

Cheers,
--
Vincent.