diff -Naur orig-incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.c incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.c
--- orig-incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.c	2017-01-17 18:58:16.000000000 +0100
+++ incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.c	2017-02-14 14:22:47.000000000 +0100
@@ -124,7 +124,8 @@
 }
 
 void guac_rdp_glyph_begindraw(rdpContext* context,
-        int x, int y, int width, int height, UINT32 fgcolor, UINT32 bgcolor) {
+        int x, int y, int width, int height, UINT32 fgcolor, UINT32 bgcolor,
+        BOOL fOpRedundant) {
 
     guac_client* client = ((rdp_freerdp_context*) context)->client;
     guac_rdp_client* rdp_client =
diff -Naur orig-incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.h incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.h
--- orig-incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.h	2017-01-17 18:58:16.000000000 +0100
+++ incubator-guacamole-server-0.9.11-incubating/src/protocols/rdp/rdp_glyph.h	2017-02-14 14:23:29.000000000 +0100
@@ -127,7 +127,8 @@
  *     transparent, this value is undefined.
  */
 void guac_rdp_glyph_begindraw(rdpContext* context,
-        int x, int y, int width, int height, UINT32 fgcolor, UINT32 bgcolor);
+        int x, int y, int width, int height, UINT32 fgcolor, UINT32 bgcolor,
+        BOOL fOpRedundant);
 
 /**
  * Called immediately after rendering a series of glyphs. Unlike