I'm stuck here too, except mine is in a different place. I'm trying to install 8.1.7 on Redhat Enterprise Server (version 3, I think).
I started up the install, with LD_ASSUME_KERNEL set to 2.2.5 as always. The install stopped with an error linking in ins_precomp.mk. At that point I installed the glibc patch, and that let me continue for a bit. But now I'm stuck on ins_oemagent.mk, getting the same ctype errors Guan describes.
I found this thread discussing the problem, which doesn't look good...
http://www.redhat.com/archives/taroon-beta-list/2003-September/msg00238.html
Has anyone managed to get past this?