diff -uNr openexr-2.1.0.orig/IlmImf/ImfSystemSpecific.h openexr-2.1.0/IlmImf/ImfSystemSpecific.h
--- openexr-2.1.0.orig/IlmImf/ImfSystemSpecific.h	2013-10-21 21:02:22.000000000 +0200
+++ openexr-2.1.0/IlmImf/ImfSystemSpecific.h	2015-01-07 15:31:25.851288890 +0100
@@ -58,6 +58,20 @@
 #define EXR_FORCEINLINE inline
 #define EXR_RESTRICT __restrict
 
+#ifdef __MINGW32__
+
+static void* EXRAllocAligned(size_t size, size_t alignment)
+{
+    return _aligned_malloc(size, alignment);
+}
+
+static void EXRFreeAligned(void* ptr)
+{
+    return _aligned_free(ptr);
+}
+
+#else
+
 static void* EXRAllocAligned(size_t size, size_t alignment)
 {
     void* ptr = 0;
@@ -65,12 +79,12 @@
     return ptr;
 }
 
-
 static void EXRFreeAligned(void* ptr)
 {
     free(ptr);
 }
 
+#endif
 #elif defined _MSC_VER
 
 #define EXR_FORCEINLINE __forceinline