Built gcc 4.3.4-3 -- howto change Trinity cmake files to use gcc 4.3.4 instead of gcc 4.5.2

Tim, all, I have built gcc 4.3.4-3 to see if that fixes the iccconfig.cpp build failure in kdebase. What I don't know is: "How to I change the cmake call or CMakeLists.txt to make sure I'm using gcc 4.3 and not 5.4?" The executable is '/usr/bin/gcc-4.3'. Do I need a CC=gcc-4.3 or CXX=gcc-4.3 somewhere? If so where? I've never tried to build anything with alternate gcc's installed. Any help would be greatly appreciated. -- David C. Rankin, J.D.,P.E.