diff -urN submodules/externals/x264/common/osdep.h.orig submodules/externals/x264/common/osdep.h
--- submodules/externals/x264/common/osdep.h.orig	2014-02-06 13:56:59.243663951 +0100
+++ submodules/externals/x264/common/osdep.h	2014-02-06 13:57:17.215685078 +0100
@@ -35,11 +35,6 @@
 
 #include "config.h"
 
-#if !HAVE_LOG2F
-#define log2f(x) (logf(x)/0.693147180559945f)
-#define log2(x) (log(x)/0.693147180559945)
-#endif
-
 #ifdef _WIN32
 #include <io.h>    // _setmode()
 #include <fcntl.h> // _O_BINARY
@@ -55,6 +60,11 @@
 #include <math.h>
 #endif
 
+#if !HAVE_LOG2F
+#define log2f(x) (logf(x)/0.693147180559945f)
+#define log2(x) (log(x)/0.693147180559945)
+#endif
+
 #if (defined(__GNUC__) || defined(__INTEL_COMPILER)) && (ARCH_X86 || ARCH_X86_64)
 #define HAVE_X86_INLINE_ASM 1
 #endif
diff -urN submodules/externals/x264/configure.orig submodules/externals/x264/configure
--- submodules/externals/x264/configure.orig	2014-02-06 13:56:59.231663937 +0100
+++ submodules/externals/x264/configure	2014-02-06 13:57:17.219685083 +0100
@@ -816,10 +816,6 @@
 fi
 [ "$thread" != "no" ] && define HAVE_THREAD
 
-if cc_check "math.h" "-Werror" "return log2f(2);" ; then
-    define HAVE_LOG2F
-fi
-
 if [ "$vis" = "yes" ] ; then
     save_CFLAGS="$CFLAGS"
     CFLAGS="$CFLAGS -I/usr/X11R6/include"