diff -Nru mysql-workbench-6.3.4+dfsg/debian/changelog mysql-workbench-6.3.4+dfsg/debian/changelog
--- mysql-workbench-6.3.4+dfsg/debian/changelog	2015-10-23 19:09:08.000000000 +0000
+++ mysql-workbench-6.3.4+dfsg/debian/changelog	2015-10-31 13:17:50.000000000 +0000
@@ -1,3 +1,9 @@
+mysql-workbench (6.3.4+dfsg-2+rpi1) stretch-staging; urgency=medium
+
+  * Fix build failure on architectures where plain char is unsigned.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Sat, 31 Oct 2015 13:17:34 +0000
+
 mysql-workbench (6.3.4+dfsg-2) unstable; urgency=medium
 
   * New upstream "gcc5.patch" from Marcin Szalowicz (fixes FTBFS).
diff -Nru mysql-workbench-6.3.4+dfsg/debian/patches/series mysql-workbench-6.3.4+dfsg/debian/patches/series
--- mysql-workbench-6.3.4+dfsg/debian/patches/series	2015-10-23 19:03:51.000000000 +0000
+++ mysql-workbench-6.3.4+dfsg/debian/patches/series	2015-10-31 13:16:04.000000000 +0000
@@ -2,3 +2,4 @@
 gcc5.patch
 pythonlibs.patch
 wbcopytables-rpath.patch
+specify-char-signedness
diff -Nru mysql-workbench-6.3.4+dfsg/debian/patches/specify-char-signedness mysql-workbench-6.3.4+dfsg/debian/patches/specify-char-signedness
--- mysql-workbench-6.3.4+dfsg/debian/patches/specify-char-signedness	1970-01-01 00:00:00.000000000 +0000
+++ mysql-workbench-6.3.4+dfsg/debian/patches/specify-char-signedness	2015-10-31 13:17:05.000000000 +0000
@@ -0,0 +1,27 @@
+Description: Fix error related to char signedness
+Author: Peter Michael Green <plugwash@debian.org>
+
+---
+The information above should follow the Patch Tagging Guidelines, please
+checkout http://dep.debian.net/deps/dep3/ to learn about the format. Here
+are templates for supplementary fields that you might want to add:
+
+Origin: <vendor|upstream|other>, <url of original patch>
+Bug: <url in upstream bugtracker>
+Bug-Debian: https://bugs.debian.org/<bugnumber>
+Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
+Forwarded: <no|not-needed|url proving that it has been forwarded>
+Reviewed-By: <name and email of someone who approved the patch>
+Last-Update: <YYYY-MM-DD>
+
+--- mysql-workbench-6.3.4+dfsg.orig/library/sql.parser/source/ctype-utf8.cpp
++++ mysql-workbench-6.3.4+dfsg/library/sql.parser/source/ctype-utf8.cpp
+@@ -3869,7 +3869,7 @@ static uint16 uni_FF20_FF5F[64]=
+ 
+ static int hexlo(int x)
+ {
+-  static char hex_lo_digit[256]=
++  static signed char hex_lo_digit[256]=
+   {
+     -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* ................ */
+     -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* ................ */