How to build a 32-bit or Leopard app on Lion?

Hi I am trying to build a test app on OSX Lion that should also run on older versions of OSX (say at least on Leopard). Thought platforms "x32" is intended for this but this just gives me a linker error when running make: ld: warning: directory not found for option '-L/usr/lib32'

Any help and pointers appreciated,
Thanks,

Well, many Linux distributions also lack /usr/lib32 (it's Debian thingy). However, "ld: warning:" should not be fatal, are you sure it's the main problem?

should have had coffee this morning ... you are right it's just a warning and the executable runs fine. Thanks annulen.