My attempts to install modperl under the default vanilla Leopard Apache 2 have failed and all I can find online are variations on this:
I would like if possible not to rely on MacPorts or Fink, though if they can be made to work with the default Apache 2 install that would probably be ok.
(The best answer is the one that I've supplied and which is languishing at the bottom, ie. export ARCHFLAGS="-arch x86_64" - hopefully someone with enough reputation will mod it up)