How does one enable thread-local storage?

I'm in the process of adding an updated glibc to my system (with prefix
/usr/local/glibc2.4/, so not to break anything using the old glibc that
came with this redhat box.)

First, I had to get the newest GCC, version 4.1.1, so I compiled it with
this configure line:

./gcc/configure --prefix=/usr/local/gcc4 --enable-threads=posix

It built, and make install then succeeded and from there, I went to
build glibc 2.4:

./glibc-2.4/configure --prefix=/usr/local/glibc2.4 --enable-addons
CC=/usr/local/gcc4/bin/gcc

In the the middle of the "checking" list I noticed "checking for
__thread... no" but it keeps going until this:


checking for __thread... no

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