Compiler selection

[Dan Aldrich]

Attempting to build gnuradio. I get the warning:

WARNING: GNU Radio's VOLK component (which handles vector optimized instructions and routines) compiles best when using GCC.  The selected compiler is CLANG, which will result in a fully functioning GNU Radio install but the VOLK component will not utilize the CPU's capabilities.

Is there a way to tell macports what compiler to use? Tried to use gcc_select, didn't work. GCC on this machine is apple's 4.2.1. Tried to do an update, but that errored off as well.

Thanks,
-d