diff --git a/libstdc++-v3/include/experimental/numeric b/libstdc++-v3/include/experimental/numeric
index a11516b..b284110 100644
--- a/libstdc++-v3/include/experimental/numeric
+++ b/libstdc++-v3/include/experimental/numeric
@@ -40,7 +40,6 @@
 #else
 
 #include <experimental/type_traits>
-#include <cmath>
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
@@ -52,7 +51,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #define __cpp_lib_experimental_gcd_lcm 201411
 
-  // Greatest common divisor
+  /// Greatest common divisor
   template<typename _Mn, typename _Nn>
     constexpr common_type_t<_Mn, _Nn>
     gcd(_Mn __m, _Nn __n)
@@ -60,12 +59,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       static_assert(is_integral<_Mn>::value, "arguments to gcd are integers");
       static_assert(is_integral<_Nn>::value, "arguments to gcd are integers");
 
-      return __m == 0 ? std::abs(__n)
-	: __n == 0 ? std::abs(__m)
-	: fundamentals_v2::gcd(__n, __m % __n);
+      return __m == 0 ? __builtin_abs(__n)
+	: __n == 0 ? __builtin_abs(__m)
+	: gcd(__n, __m % __n);
     }
 
-  // Least common multiple
+  /// Least common multiple
   template<typename _Mn, typename _Nn>
     constexpr common_type_t<_Mn, _Nn>
     lcm(_Mn __m, _Nn __n)
@@ -74,7 +73,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       static_assert(is_integral<_Nn>::value, "arguments to lcm are integers");
 
       return (__m != 0 && __n != 0)
-	? (std::abs(__m) / fundamentals_v2::gcd(__m, __n)) * std::abs(__n)
+	? (__builtin_abs(__m) / gcd(__m, __n)) * __builtin_abs(__n)
 	: 0;
     }