Short answer: gcc 4.1.2 running on a fairly stock CentOS 5.5 with kernel 
2.6.18-194.26.1.el5 (x86_64).  It is running on a VM (kvm), with source 
files sitting on an NFS served partition (I mention this because I know 
NFS+VM+ntp/time+make can cause problems).

I've compiled sage in the past on other similar systems without a problem.

Any reason Sage uses MPIR 1.2.2.p2 which is a few years old instead of the 
latest version?  I can see some threads which describe a 2.x version of MPIR 
compiled into Sage.

Regards,

Ian

[root@portal sage-4.6.2]# gcc --version
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-48)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[root@portal sage-4.6.2]# cat /etc/redhat-release 
CentOS release 5.5 (Final)

[root@portal sage-4.6.2]# uname -a
Linux portal.nebiogrid.org 2.6.18-194.26.1.el5 #1 SMP Tue Nov 9 12:54:20 EST 
2010 x86_64 x86_64 x86_64 GNU/Linux

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