any met python import paramiko and Crypto err like "Not using mpz_powm_sec."?

OS: redhat 5.2 i386

python: 2.7

err like:

Python 2.7.2 (default, Feb  7 2012, 11:16:30) 
[GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import paramiko
/home/master/local/lib/python2.7/site-packages/Crypto/Util/number.py:57: PowmInsecureWarning: Not using mpz_powm_sec.  You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.
  _warn("Not using mpz_powm_sec.  You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.", PowmInsecureWarning)

it's my libgmp version:

 ldconfig -p |grep libgmp
        libgmpxx.so.3 (libc6, hwcap: 0x0000000004000000) => /usr/lib/sse2/libgmpxx.so.3
        libgmpxx.so.3 (libc6) => /usr/lib/libgmpxx.so.3
        libgmpxx.so (libc6) => /usr/lib/libgmpxx.so
        libgmp.so.3 (libc6, hwcap: 0x0000000004000000) => /usr/lib/sse2/libgmp.so.3
        libgmp.so.3 (libc6) => /usr/lib/libgmp.so.3
        libgmp.so (libc6) => /usr/lib/libgmp.so

all above seems like related to libgmp, that confused me.PLZ show me some suggestion, thx!