This is a glibc 2.1 compatibility C software development kit for glibc
2.2. It is built under RedHat 7.0. 

To install, just untar i386-glibc-2.1-linux.tar.gz under /. The glibc
2.1 SDK will be installed under /usr/i386-glibc-2.1-linux. You can
use /usr/i386-glibc-2.1-linux/bin/i386-glibc21-linux-gcc to compile/
link applications which are not compatible with glibc 2.2.

Please note that glibc 2.2 is 100% run-time compatible with previous
releases for glibc 2.x. This SDK is a compile/link time tool. It is
not needed for the run-time compatibility for glibc 2.1. However, if
there is a need to use glibc 2.1 at run-time, you can do

# /usr/i386-glibc-2.1-linux/bin/i386-glibc21-linux-gcc -run-time ...

to make the application use glibc 2.1 at run-time.