Problem compiling firefox (glib-problem?)

Dear all, I tried to compile firefox (1.0rc2) but I keep getting error-messages like this:

GLib-ERROR **: could not reallocate 34359738368 bytes aborting...

Somebody from the firefox list told me to compile glib 1.2.10 again. I tried, but ./configure stops with:

checking host system type... Invalid configuration `x86_64-unknown-linux-gnu': machine `x86_64-unknown' not recognized

checking build system type... Invalid configuration `x86_64-unknown-linux-gnu': machine `x86_64-unknown' not recognized Can anybody give me a hint please, what's wrong here?

Thank you, Gery