diff --git a/glm/core/func_integer.inl b/glm/core/func_integer.inl
index cbbad8f3..185f082d 100644
--- a/glm/core/func_integer.inl
+++ b/glm/core/func_integer.inl
@@ -522,7 +522,7 @@ namespace glm
 	}
 
 	// findMSB
-#if(GLM_COMPILER & GLM_COMPILER_VC)
+#if((GLM_ARCH != GLM_ARCH_PURE) && (GLM_COMPILER & GLM_COMPILER_VC))
 
 	template <typename genIUType>
 	GLM_FUNC_QUALIFIER int findMSB
@@ -535,7 +535,7 @@ namespace glm
 		return int(Result);
 	}
 
-#elif((GLM_COMPILER & GLM_COMPILER_GCC) && __has_builtin(__builtin_clz))
+#elif((GLM_ARCH != GLM_ARCH_PURE) && (GLM_COMPILER & GLM_COMPILER_GCC) && (GLM_COMPILER >= GLM_COMPILER_GCC40))
 
 	template <typename genIUType>
 	GLM_FUNC_QUALIFIER int findMSB
@@ -543,7 +543,7 @@ namespace glm
 		genIUType const & Value
 	)
 	{
-		return __builtin_clz(x);
+		return __builtin_clz(Value);
 	}
 
 #else
diff --git a/test/gtx/gtx_integer.cpp b/test/gtx/gtx_integer.cpp
index a3429387..1a77db3f 100644
--- a/test/gtx/gtx_integer.cpp
+++ b/test/gtx/gtx_integer.cpp
@@ -10,7 +10,7 @@
 #include <glm/glm.hpp>
 #include <glm/gtx/integer.hpp>
 #include <glm/gtx/epsilon.hpp>
-#include <iostream>
+#include <cstdio>
 
 int test_floor_log2()
 {