diff -up extlibs/headers/stb_image/stb_image.h~ extlibs/headers/stb_image/stb_image.h
--- extlibs/headers/stb_image/stb_image.h~	2015-08-24 18:01:06.000000000 +0200
+++ extlibs/headers/stb_image/stb_image.h	2016-02-27 22:53:15.712543109 +0100
@@ -671,14 +671,9 @@ static int stbi__sse2_available()
 
 static int stbi__sse2_available()
 {
-#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later
-   // GCC 4.8+ has a nice way to do this
-   return __builtin_cpu_supports("sse2");
-#else
-   // portable way to do this, preferably without using GCC inline ASM?
-   // just bail for now.
-   return 0;
-#endif
+   // We only enable SSE2 on gcc when build with -msse2, so it is always
+   // safe to use SSE2, simply return 1
+   return 1;
 }
 #endif
 #endif