I've trying to use "pkgsrc" under Mac OS X Snow Leopard. Boot-strapping worked without problems. But a bunch of packages fail to build because "uname -m" reports "i386" but "gcc" creates x86_64 binaries by default (at least on my system).Even with a 32-bit kernel, Snow Leopard is still capable of running 64-bit applications, and in fact all the (universal) binaries have 64-bit versions in them. IMO, pkgsrc should follow the system default: building x86_64 binaries.
I can't see any reason to build 32 bit binaries by default except on 32 bit-only Macs. On the other hand, a simple mk.conf option would be nice.
John