> Can icc and gcc co-exist on the same machine? Absolutely. They don't "collide" compiler-driver-wise. ICC installs into /opt in fact, by default. You can even build completely-static binaries so you can always be sure the faster Intel math libraries are being used. You can also static only the Intel mathlib override portions, and leave the app shared-linked against the "normal" glibc stuff. My kingdom for Quality, =MB= -- A focus on Quality.