math.patch

diff --git a/pythran/pythonic++/modules/math.h b/pythran/pythonic++/modules/math.h
index 1701f47..df1f189 100644
--- a/pythran/pythonic++/modules/math.h
+++ b/pythran/pythonic++/modules/math.h
@@ -1,6 +1,8 @@
 #ifndef PYTHONIC_MODULE_MATH_H
 #define PYTHONIC_MODULE_MATH_H
 
+#include <gmpxx.h>
+
 namespace pythonic {
     namespace math {
         using std::acos;
@@ -74,6 +76,14 @@ namespace pythonic {
         template<class T>
             double radians(T x) { return (x * 2. * pi) / 360.; }
 
+        /* sqrt(mpz_class) returns an int, while a square of a long in python
+         * returns a floating point number.
+         *
+         * So even if it's ugly we have to convert the number to a float, */
+        double sqrt(const mpz_class &mpz) {
+            return std::sqrt(mpz.get_d());
+        }
+
         PROXY(pythonic::math,isinf);
         PROXY(pythonic::math,modf);
         PROXY(pythonic::math,frexp);