From d874ac40d24cb3e6bced6f4abca6b6578a42f683 Mon Sep 17 00:00:00 2001
From: Ward Fisher <wfisher@ucar.edu>
Date: Mon, 28 Dec 2015 15:52:54 -0700
Subject: [PATCH] Avoiding system conflict if __UNSIGNED_CHAR__ is already
 defined.

---
 config.h.cmake.in | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/config.h.cmake.in b/config.h.cmake.in
index 4bf340f7e..89da03234 100644
--- a/config.h.cmake.in
+++ b/config.h.cmake.in
@@ -210,7 +210,9 @@ are set when opening a binary file on Windows. */
 #cmakedefine HAVE_FILE_LENGTH_I64 @HAVE_FILE_LENGTH_I64@
 
 /* Define whether char is signed by default. */
-//#cmakedefine __CHAR_UNSIGNED__
+#ifndef __CHAR_UNSIGNED__
+#cmakedefine __CHAR_UNSIGNED__
+#endif
 
 /* The size of `void*` as computed by sizeof. */
 #cmakedefine SIZEOF_VOIDSTAR @SIZEOF_VOIDSTAR@