FYI: Buidling pygobject with libffi.

[rainwoodman]

Currently libffi installs the header to $CONDA_PREFIX/include. The cross compilation tools cannot find these headers. libffi shall perhaps be converted to cdt .

I ran into this issue while building pygobject with the cdt packages and pip install -- had to create a symlink to the header files in $CONDA_PREFIX/x86_64-conda_cos6-linux-gnu/sysroot/usr/include to proceed.

The pip install compiled pygobject package worked with the host platform's gtk-3 after setting

GIR_PATH=/usr/share/gir-1.0/
GI_TYPELIB_PATH=/usr/lib64/girepository-1.0/

This could be a way to get around the low gtk version currently provided by anaconda. xdot requires gtk3.