Hi Martin,
Yes, just found that solution. I'm installing glibc-static right now.
http://old.nabble.com/Error-Compiling-Gumstix-Image-On-Fedora-12-x86_64-td26776355.html#a26776355
Anyway, I'm updating my setup notes for Fedora 12 x86 64-bit, so it will help others doing this.
Best regards,
Elvis