This is the GNU glibc-2.0.5c.tgz binary package (a.k.a. libc.so.6).

If you want to develop applications using GNU libc, just install this 
package, and programs will be compiled using glibc by default:

installpkg glibc-2.0.5c.tgz

Note, this version of glibc was not compiled with the DES crypt add-on, 
although it does provide a crypt() function based on MD5.  I'd have liked
to include the real crypt(), but then wouldn't be able to export the
resulting library.  If you really need DES crypt(), you'll have to download
the glibc-crypt-2.0.5.tar.gz add-on and compile it yourself.  It can be 
found on prep.ai.mit.edu, in /pub/gnu.  If you are outside the USA and Canada,
do not download glibc-crypt-2.0.5.tar.gz from prep (to do so violates US 
export restrictions).  There should be a readme file there that will point you
to a non-US FTP site.

This library does include the 'linuxthreads' add-on, which provides clone()
and other threads-related functions.

If for some reason you want to switch back, first change into 
the /usr/lib/gcc-lib/i486-unknown-linux-gnulibc1/2.7.2.3/ directory and revert
to the old "specs" file:

cd /usr/lib/gcc-lib/i486-unknown-linux-gnulibc1/2.7.2.3/
cp specs.linux.libc.so.5 specs

Then, install the old 'libc.tgz' package again, and then remove glibc
like this:

cd <directory containing libc.tgz, such as /cdrom/slakware/d8>
installpkg libc.tgz
cd /var/log/packages
removepkg glibc-2.0.5c

Have fun!