cmake howto: ignoring /usr/local

[René J.V. Bertin]

A quick question concerning the MacPorts cmake-fu: I've noticed that you've managed to get cmake to ignore everything installed in /usr/local . I've tried invoking /opt/local/bin/cmake directly (= not through port) with the exact same arguments as port uses, but then it does find libraries I installed myself in /usr/local .

So: how do you manage to let /usr/local be ignored - clearly you don't rename it temporarily, nor is cmake executed in a chroot ...

Thanks in advance :)
R.