On Ubuntu and Macports/OSX libusb 0.1 installs a pc file called libusb.pc. On FreeBSD it's libusb-0.1.pc which seems gratuitously different. While I appreciate libusb.pc should have the version it seems like a gratuitous difference. Perhaps libusb.pc could be a link to libusb-0.1.pc?
In fact we have: lib/libusb/libusb-0.1.pc.in lib/libusb/libusb-1.0.pc.in lib/libusb/libusb-2.0.pc.in These are identical except for the reported versions (0.1.0, 1.0.13, 2.0.0) and are handled identically via lib/libusb/Makefile: PCFILES= libusb-0.1.pc libusb-1.0.pc libusb-2.0.pc .for pcfile in ${PCFILES} ${pcfile}: ${pcfile}.in sed -e 's,@libdir@,${LIBDIR},g ; s,@sharedlibdir@,${SHLIBDIR},g ; \ s,@includedir@,${INCLUDEDIR},g ;' ${.ALLSRC} > ${.TARGET} .endfor