devel/dotconf installs it's .pc files in $(prefix)/lib, while FreeBSD
hierarchy rules says that such files should go into libdata. pkgconfig
was changed to comply with these rules so it can not find .pc files which does
not reside in libdata.
Fix: Added USE_GNOME=gnomehack to devel/dotconf/Makefile and changed
How-To-Repeat: cd /usr/ports/devel/dotconf
Over to maintainer.