[X-Unix] Compile for PowerPC and Intel on Intel?

[TjL]

Is it possible (and, if so, how) to compile programs like the GNU Core
Utils or GNU Sed on an Intel Mac and end up with a "Universal" binary
which will work on both PowerPC (i.e. my Powerbook) and an Intel (my
MacBook)?

TjL

ps - GNU Sed 4.15 won't compile on Leopard unless you have a GNU Sed
already installed. If you want to install 4.15, first install 3.0.2

http://ftp.club.cc.cmu.edu/pub/gnu/sed/sed-3.02.tar.gz

http://ftp.club.cc.cmu.edu/pub/gnu/sed/sed-4.1.5.tar.gz

which is a tip I picked up here:
http://blog.apokalyptik.com/2008/04/24/building-sed-for-osx/