GUACAMOLE-249: The FreeRDPConvertColor() function is also known as ConvertColor(), but was only available as ConvertColor() in older FreeRDP 2.0.0 release candidates.

configure.ac

@@ -541,7 +541,8 @@ AC_ARG_WITH([rdp],
 if test "x$with_rdp" != "xno"
 then
     have_freerdp2=yes
-    PKG_CHECK_MODULES([RDP], [freerdp2 freerdp-client2 winpr2],,
+    PKG_CHECK_MODULES([RDP], [freerdp2 freerdp-client2 winpr2],
+                      [CPPFLAGS="${RDP_CFLAGS} $CPPFLAGS"],
                       [AC_MSG_WARN([
   --------------------------------------------
    Unable to find FreeRDP (libfreerdp2 / libfreerdp-client2 / libwinpr2)
@@ -550,6 +551,19 @@ then
                        have_freerdp2=no])
 fi
 
+# Available color conversion functions
+if test "x$have_freerdp2" = "xyes"
+then
+
+    # FreeRDP 2.0.0-rc3 and older referred to FreeRDPConvertColor() as
+    # ConvertColor()
+    AC_CHECK_DECL([FreeRDPConvertColor],
+                  [AC_DEFINE([HAVE_FREERDPCONVERTCOLOR],,
+                             [Whether FreeRDPConvertColor() is defined])],,
+                  [#include <freerdp/codec/color.h>])
+
+fi
+
 AM_CONDITIONAL([ENABLE_RDP], [test "x${have_freerdp2}" = "xyes"])
 
 #

src/protocols/rdp/color.c

@@ -17,6 +17,7 @@
  * under the License.
  */
 
+#include "config.h"
 #include "settings.h"
 
 #include <freerdp/codec/color.h>
@@ -59,8 +60,12 @@ UINT32 guac_rdp_convert_color(rdpContext* context, UINT32 color) {
 
     /* Convert color from RDP source format to the native format used by Cairo,
      * still maintaining intermediate representation */
+#ifdef HAVE_FREERDPCONVERTCOLOR
     intermed = FreeRDPConvertColor(intermed, src_format, dst_format,
             &gdi->palette);
+#else
+    intermed = ConvertColor(intermed, src_format, dst_format, &gdi->palette);
+#endif
 
     /* Convert color from intermediate representation to the actual desired
      * format */