This talk is missing its intro - Slides available:

Building custom packages for a powerpc or mips network appliance that's too painfully small to build anything itself? With pkgsrc, the customizable cross-platform packaging system from NetBSD, you can cross-build from a large repository of packages on your beefier laptop, workstation, or server instead -- and not just across architectures, but soon across operating systems too.

pkgsrc will automatically handle natively building toolchain packages needed as dependencies to cross-build packages, so you don't have to fuss with manually assembling all the parts of a cross-compiler toolchain in advance. Most packages require relatively little work to adapt to cross-builds.

This talk will discuss the state of cross-compilation in pkgsrc: