Add custom compiler in Xcode?

Hi,

I have a target for a simple C - Command line tool.
It's working fine, but I'd like to use a special version of gcc to compile it.

I installed the GCC (v4.3.2) and can compile my sources via command line and makefile without any problems.

But, can I somehow tell Xcode to use this gcc to compile the sources?
If I just change the GCC_VERSION in the Build-Settings of my target, I always end up with error messages telling me "invalid value 4.3.2 for GCC_VERSION".

In the terminal I can use this gcc via:
gcc-432

If I put this to the GCC_VERSION, I get the same error.. ("Invalid value gcc-432 ... ")

Any ideas?

Aya~