diff --git a/M4/clang.m4 b/M4/clang.m4
new file mode 100644
index 00000000..2d6499e9
--- /dev/null
+++ b/M4/clang.m4
@@ -0,0 +1,31 @@
+dnl @synopsis MN_C_COMPILER_IS_CLANG
+dnl
+dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
+dnl @version 1.0	Oct 31 2013
+dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+dnl
+dnl Permission to use, copy, modify, distribute, and sell this file for any
+dnl purpose is hereby granted without fee, provided that the above copyright
+dnl and this permission notice appear in all copies.  No representations are
+dnl made about the suitability of this software for any purpose.  It is
+dnl provided "as is" without express or implied warranty.
+dnl
+
+
+AC_DEFUN([MN_C_COMPILER_IS_CLANG],
+[AC_CACHE_CHECK(whether we are using the CLANG C compiler,
+	mn_cv_c_compiler_clang,
+	[	AC_LANG_ASSERT(C)
+		AC_TRY_LINK([
+			#include <stdio.h>
+			],
+			[
+			#ifndef __clang__
+				This is not clang!
+			#endif
+			],
+		AC_MSG_RESULT([yes]),
+		AC_MSG_RESULT([no])
+		])
+	)
+])
diff --git a/M4/really_gcc.m4 b/M4/really_gcc.m4
new file mode 100644
index 00000000..67aed780
--- /dev/null
+++ b/M4/really_gcc.m4
@@ -0,0 +1,33 @@
+dnl @synopsis MN_GCC_REALLY_IS_GCC
+dnl
+dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
+dnl @version 1.0	Oct 31 2013
+dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+dnl
+dnl Permission to use, copy, modify, distribute, and sell this file for any
+dnl purpose is hereby granted without fee, provided that the above copyright
+dnl and this permission notice appear in all copies.  No representations are
+dnl made about the suitability of this software for any purpose.  It is
+dnl provided "as is" without express or implied warranty.
+dnl
+
+# If the configure script has already detected GNU GCC, then make sure it
+# isn't CLANG masquerading as GCC.
+
+AC_DEFUN([MN_GCC_REALLY_IS_GCC],
+[	AC_LANG_ASSERT(C)
+	if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
+		AC_TRY_LINK([
+			#include <stdio.h>
+			],
+			[
+			#ifdef __clang__
+				This is clang!
+			#endif
+			],
+		ac_cv_c_compiler_gnu=yes,
+		ac_cv_c_compiler_gnu=no
+		)
+		fi
+
+])
diff --git a/configure.ac b/configure.ac
index 7f6481a4..510ebf2e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,10 @@ AC_PROG_CC_STDC
 AC_USE_SYSTEM_EXTENSIONS
 AM_PROG_CC_C_O
 AC_PROG_CXX
+
+MN_C_COMPILER_IS_CLANG
+MN_GCC_REALLY_IS_GCC
+
 AC_PROG_SED
 
 # Do not check for F77.
@@ -661,10 +665,11 @@ if test -z "$PKG_CONFIG" ; then
 	echo
 	fi
 
+echo "  Tools :"
+echo
+echo "    Compiler is GCC : ..................... ${ac_cv_c_compiler_gnu}"
+
 if test x$ac_cv_c_compiler_gnu = xyes ; then
-	echo "  Tools :"
-	echo
-	echo "    Compiler is GCC : ..................... ${ac_cv_c_compiler_gnu}"
 	echo "    GCC version : ......................... ${GCC_VERSION}"
 	if test $GCC_MAJOR_VERSION -lt 3 ; then
 		echo "\n"