Another thing you may try is setting USE_DESTDIR=yes (or "full")
(assuming the package supports user-destdir).  Then, when you 'make
package', the package's files will be installed to ${DESTDIR}; thus,
make package will succeed.

I should probably add some stuff about DESTDIR support to the pkgsrc
guide; hopefully I can do that soon.  It's useful in a wide variety of
situations.

Regards,

--Blair