diff -rNU3 gcc-4.5.3/configure dist/configure
--- gcc-4.5.3/configure	Wed Nov  7 20:12:53 2012
+++ dist/configure	Wed Nov  7 19:25:20 2012
@@ -5321,7 +5321,7 @@
 
 
 # Check for GMP, MPFR and MPC
-gmplibs="-lmpc -lmpfr -lgmp"
+gmplibs="-lmpc -lmpfr -lgmp -lm"
 gmpinc=
 have_gmp=no