Any ideas on how to resolve this conflicts error below?

I'm trying to install gcc4-4.1.2-44.EL4_8.1.i386.rpm on my redhat 5.x system but need a lot of dependencies.

dependency - kernel-headers-2.2.19-1.0.291.i386.rpm, installed okaydependency - glibc-headers-2.8.90-11.i386.rpm,               [root@bruce glibc-headers]# rpm -ivh glibc*               error: Failed dependencies:              glibc = 2.8.90-11 is needed by glibc-headers-2.8.90-11.i386dependency - glibc-2.3.4-2.i386.rpm              [root@bruce glibc]# rpm -ivh glibc*              warning: glibc-2.3.4-2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 73307de6 error: Failed dependencies:              glibc-common = 2.3.4-2 is needed by glibc-2.3.4-2.i386              glibc < 2.5 conflicts with glibc-common-2.5-18.i386