The following are the minimum required release levels for Red Hat Enterprise Linux 3.0 32-bit version:
kernel version - 2.4.21-20.ELsmp
glibc - 2.2.4-29 or later
gcc 3.2.3 or later
The following are the minimum required release levels for Red Hat Enterprise Linux 4.0 on Itanium 64-bit:
kernel version - 2.6.9-42 or later
glibc-2.3.4-2.25 or later
gcc 3.4.6-3 (20060404) or later