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--- a/src/common/autoconfig-win.h
+++ b/src/common/autoconfig-win.h
@@ -21,7 +21,7 @@
 #define FILE_PROG "/usr/bin/file"
 
 /* "Have C++0x" */
-#undef HAVE_CXX0X_UNORDERED
+#define HAVE_CXX0X_UNORDERED 1
 
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #define HAVE_DLFCN_H 1