OK, I am running Redhat 7.2 and have followed the guides here compiling both the GCC3 and the new QT. I have changed the configs in QT to g++3 and gcc3 in all the areas mentioned, but when I try to do a make I get this:

Make[2]: Entering directory `/usr/local/qt/src/moc"
g++3 -c -I/usr/local/qt/include -Wno-unused -Wno-parenthesis -pipe -02 -Wall -W -DQT_NO_CODECS -DQT_LITE_UNICODE -I../../include -I../tools -I. -o mocgen.o mocgen.cpp

Make[2]: g++3:Command not found
Make[2]: *** [mocgen.o] Error 127

Then it backs out of the directory.

Any hints what I am doing wrong?