We are running GCC v3.4.4 on the Red Hat Enterprise Linux 4 64-Bit platform. Questions specific to the 64-bit version are... 1) Does v4.4.0 support the Red Hat Enterprise Linux 4 (64-Bit) platform? 2) Is code developed under GCC v3.4.4 guaranteed to compile under GCC v4.4.0? V/R, Andrew Myers