Compiling sfs with a specified gmp

Hi!!

Would anyone tell me which directory should I use to compile sfs with
--with-gmp option?

I run

# rpm -qa | grep gmp
gmp-4.1.3-3

# rpm -ql gmp-4.1.3-3

and I can see several directories, and I see

/usr/include/gmp.h

but when I configure sfs:

# ../configure --with-gmp=/usr/include

the following error occurs:

checking for GMP library... configure: error: Could not find gmp.h header

Is that the wrong directory? Which should I use?
Can anyone help me please?
Thanks!

Ana