diff -up webkitgtk-2.4.8/Source/autotools/CheckSystemAndBasicDependencies.m4.gcc5 webkitgtk-2.4.8/Source/autotools/CheckSystemAndBasicDependencies.m4
--- webkitgtk-2.4.8/Source/autotools/CheckSystemAndBasicDependencies.m4.gcc5	2015-01-07 10:45:43.000000000 +0100
+++ webkitgtk-2.4.8/Source/autotools/CheckSystemAndBasicDependencies.m4	2015-02-18 13:09:57.359888184 +0100
@@ -87,12 +87,12 @@ AC_SYS_LARGEFILE
 c_compiler="unknown"
 AC_LANG_PUSH([C])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
-#if !(defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 7)
+#if !(defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)))
 #error Not a supported GCC compiler
 #endif
 ])], [c_compiler="gcc"], [])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
-#if !(defined(__clang__) && __clang_major__ >= 3 && __clang_minor__ >= 3)
+#if !(defined(__clang__) && (__apple_build_version__ >= 4250024 || (!defined(__apple_build_version__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3)))))
 #error Not a supported Clang compiler
 #endif
 ])], [c_compiler="clang"], [])
@@ -106,12 +106,12 @@ fi
 cxx_compiler="unknown"
 AC_LANG_PUSH([C++])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
-#if !(defined(__GNUG__) && defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 7)
+#if !(defined(__GNUG__) && defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)))
 #error Not a supported G++ compiler
 #endif
 ])], [cxx_compiler="g++"], [])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
-#if !(defined(__clang__) && __clang_major__ >= 3 && __clang_minor__ >= 3)
+#if !(defined(__clang__) && (__apple_build_version__ >= 4250024 || (!defined(__apple_build_version__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3)))))
 #error Not a supported Clang++ compiler
 #endif
 ])], [cxx_compiler="clang++"], [])