example MAKE_ENV+=FOO=${BAR} is changed to MAKE_ENV+=FOO=${BAR:Q}. Some other changes are outlined in http://mail-index.netbsd.org/tech-pkg/2005/12/02/0034.html
in traditional address/netmask format and in the new CIDR format. There are also methods for calculating the network and broadcast address and also to see check if a given address is in a specific network.