libffi cluebat please?

[Shirley and larry <saallan%wightman.ca@localhost>]

I have  5.1r3 on a Q610. The files, mostly,  in the current pkgsrc 
either make and install or caution against installing for security reasons.
The remaining,  gramps, geneweb and python2.6 and others,  depend on 
being able to install libffi.
libffi expects cachectl.h which I cannot 'find' nor  'tree -f' .


Could I have a Lifeline, please?

Thanks, Larry