diff --git a/config_cmake.h.in b/config_cmake.h.in
index 47cfcc5e2..8071546fd 100644
--- a/config_cmake.h.in
+++ b/config_cmake.h.in
@@ -153,6 +153,9 @@
 /* The size of wchar_t in bits. */
 #define WCHAR_T_BITS ${WCHAR_T_BITS}
 
+/* Define if xlocale.h is required for locale_t or wide character support */
+#cmakedefine HAVE_XLOCALE_H 1
+
 /* Enable large inode numbers on Mac OS X 10.5.  */
 #ifndef _DARWIN_USE_64_BIT_INODE
 # define _DARWIN_USE_64_BIT_INODE 1
diff --git a/src/wutil.h b/src/wutil.h
index 28a8540d1..661e82d05 100644
--- a/src/wutil.h
+++ b/src/wutil.h
@@ -10,6 +10,10 @@
 #include <locale.h>
 #include <string>
 
+#ifdef HAVE_XLOCALE_H
+#include <xlocale.h>
+#endif
+
 #include "common.h"
 #include "maybe.h"