On FreeBSD dev-libs/libusb and sys-freebsd/freebsd-lib[usb] are blocking each other. Like dev-libs/libusb, sys-freebsd/freebsd-lib[usb] supplies a libusb, and this is captured by virtual/libusb. Shouldn't net-print/cups therefore depend on virtual/libusb instead of dev-libs/libusb? Seems to compile and print just fine on FreeBSD-8. Reproducible: Always Steps to Reproduce:
Fixed in net-print/cups-1.4.4-r2.