Instructions for installing photopc with USB support under FreeBSD/NetBSD
(if you only need USB support it isn't necessary to chmod u+s photopc):

tar -zxf libusb-0.2.0J.tar.gz
cd libusb-0.2.0J
./configure
gmake
gmake install
ln -s /usr/local/include/usb.h /usr/include
ln -s /usr/local/lib/libusb.a /usr/lib
ln -s /usr/local/lib/libusb.so /usr/lib
chmod 4755 /usr/local/lib/libusb.la
chmod 4755 /usr/local/lib/libusb-0.2.so.0
cd ..

tar -zxf photopc-3.05J18.tar
cd photopc-3.05J18
./configure
gmake
gmake install

chmod 666 /dev/usb*