-libtool, automake, autoconf and libusb can be easily installed via
-MacPorts:
- sudo port install libtool automake autoconf libusb [libusb-compat]
+libtool, automake, autoconf, pkg-config and libusb can be easily
+installed via MacPorts:
+ sudo port install libtool automake autoconf pkgconfig libusb [libusb-compat]