glibc linker problem on FC5

[Peter Scott]

I have experienced a recent problem:  After updating glibc
(using yum update glibc) I'm finding I can no longer compile C
programs; they fail to link, yielding the error message

/usr/lib/../lib64/libm.so: file not recognized: File format
not recognized
collect2: ld returned 1 exit status

uname -a says

Linux localhost.localdomain 2.6.17-1.2139_FC5 #1 SMP Fri Jun
23 12:40:11 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux

gcc --version says

gcc (GCC) 4.1.1 20060525 (Red Hat 4.1.1-1)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

I have an athlon AMD A64 3800+ dual-core CPU.

Any thoughts about how I might fix this?  (I am a little new
to FC5 and yum.)

    -- Peter