[ruby-talk:5175] Compiling 1.6.1 problem

Compiling Ruby 1.6.1 fails:

gcc -g -O2 -I. -I. -I/usr/local/include -c eval.c
eval.c: In function `Init_eval':
eval.c:5706: storage size of `rlim' isn't known
eval.c:5708: `RLIMIT_STACK' undeclared (first use in this function)
eval.c:5708: (Each undeclared identifier is reported only once
eval.c:5708: for each function it appears in.)
make: *** [eval.o] Error 1

This is a straight ./configure i586-pc-linux.

Here's the output of ver_linux:

Linux kubrick 2.4.0-test7 #5 Fri Sep 8 14:55:52 EDT 2000 i586
Kernel modules         2.1.121
Gnu C                  2.95.2
Binutils               2.10
Linux C Library        2.1.2
Dynamic linker         ldd (GNU libc) 2.1.2
Procps                 2.0.4
Mount                  2.9u
Net-tools              1.53
Console-tools          1999.03.02
Sh-utils               2.0

Can someone point me in the right direction?  Thanks.
-- 
Tony Reed
<[e-mail]>