commit 3618aa2171674babf79ef935aa049c40a3db1321
Author: asfernandes <asfernandes@users.sourceforge.net>
Date:   Sat Mar 5 03:39:36 2016 +0000

    Make the generated code compatible with gcc 6 in C++-14 mode.

diff --git a/src/gpre/c_cxx.cpp b/src/gpre/c_cxx.cpp
index 2af96c6..2dcffd6 100644
--- a/src/gpre/c_cxx.cpp
+++ b/src/gpre/c_cxx.cpp
@@ -2820,7 +2820,7 @@ static void gen_request(const gpre_req* request)
 		printa(0, "static %sshort\n   isc_%dl = %d;",
 			   (request->req_flags & REQ_extend_dpb) ? "" : CONST_STR,
 			   request->req_ident, request->req_length);
-		printa(0, "static %schar\n   isc_%d [] = {", CONST_STR, request->req_ident);
+		printa(0, "static %sunsigned char\n   isc_%d [] = {", CONST_STR, request->req_ident);
 
 		const TEXT* string_type = "blr";
 		if (gpreGlob.sw_raw)
