On Mon, May 5, 2008 at 8:17 PM, Toufique, Imam <imam.toufique@xxxxxxxxx> wrote: > Hi Tom, ... > Here is my original configure line: ... > ./configure --prefix=${INSTALL_PREFIX} Hm, looks like you built gcc in its source directory--definitely a no-no and may be the source of your problems. Try following the recommended procedure and build it in (and install it from) a clean build directory away from the gcc source. I have built gcc many times with mixed versions and have had no problems (except with Qt which hides its make process from the user) by doing something like: tar -xjvf gcc-x.y.z.bz2 mkdir gcc_build cd gcc_build ../gcc-x.y.z/configure --program-suffix=-x.y.z ... sudo make install Then, after installation, gcc-x.y.z (and other <glang>-x.y.z) is in my local bin and libs and I can select the version I want. -Tom