Valgrind + openFrameworks on OSX

Hi all, I'm trying to run Valgrind on my current project on OSX. I can get valgrind (and cachegrind, callgrind etc.) to work fine on x86-64 programs but it bails out on my openFrameworks project I get:

valgrind: ./TESTAPP: cannot execute binary file

I wondered if it was a 32-bit/64-bit thing, so I tested valgrind with a hello world program compiled with -m32 and got the same error.

I was wondering if either the newest version of openFrameworks can build x86-64 programs or if anybody has any hints on how to get valgrind grinding on the 32-bit version on OSX.