Finally working compile.

configure.ac

@@ -363,6 +363,15 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <winpr/wtypes.h>
                                     rdpBitmap b = { .Decompress = __decompress };]])],,
                   [AC_DEFINE([LEGACY_RDPBITMAP])])
 
+#
+# FreeRDP: rdpPalette
+#
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <freerdp/update.h>
+                                    rdpPalette p;
+                                    PALETTE_ENTRY* foo = p.entries;]])],,
+                  [AC_DEFINE([LEGACY_RDPPALETTE])])
+
 #
 # FreeRDP: wMessage / RDP_EVENT
 #

src/protocols/rdp/rdp_gdi.c

@@ -462,7 +462,11 @@ void guac_rdp_gdi_palette_update(rdpContext* context, PALETTE_UPDATE* palette) {
 
     CLRCONV* clrconv = ((rdp_freerdp_context*) context)->clrconv;
     clrconv->palette->count = palette->number;
+#ifdef LEGACY_RDPPALETTE
     clrconv->palette->entries = palette->entries;
+#else
+    memcpy(clrconv->palette->entries, palette->entries, sizeof(palette->entries));
+#endif
 
 }
 

src/protocols/rdp/rdp_glyph.c

@@ -145,7 +145,7 @@ void guac_rdp_glyph_begindraw(rdpContext* context,
 
     /* Convert foreground color */
     fgcolor = freerdp_color_convert_var(fgcolor,
-            context->instance->settings->color_depth, 32,
+            guac_client_data->settings.color_depth, 32,
             ((rdp_freerdp_context*) context)->clrconv);
 
     /* Fill background with color if specified */
@@ -161,7 +161,7 @@ void guac_rdp_glyph_begindraw(rdpContext* context,
 
         /* Convert background color */
         bgcolor = freerdp_color_convert_var(bgcolor,
-                context->instance->settings->color_depth, 32,
+                guac_client_data->settings.color_depth, 32,
                 ((rdp_freerdp_context*) context)->clrconv);
 
         /* Fill background */

src/protocols/rdp/rdp_settings.h

@@ -41,6 +41,8 @@
 #include <freerdp/freerdp.h>
 #include <guacamole/client.h>
 
+#include "rdp_keymap.h"
+
 /**
  * The default RDP port.
  */