our compiler can't convert longlong to float? 5.1-RC1

[leafy]

I got this strange message and a core dump after installing 
5.1-RC1 cdrom iso

checking if c++ supports bool types... yes
checking if conversion of longlong to float works... Segmentation fault
(core du
mped)
no
configure: error: Your compiler cannot convert a longlong value to a float!
If you are using gcc 2.8.# you should upgrade to egcs 1.0.3 or newer and try
again

This happened when I tried to compile mysql-client

Jiawei Ye
-- 
"Without the userland, the kernel is useless."
               --inspired by The Tao of Programming