diff --git a/wxwin.m4 b/wxwin.m4
index f8e5b704a2..0656111107 100644
--- a/wxwin.m4
+++ b/wxwin.m4
@@ -602,12 +602,12 @@ AC_DEFUN([WX_STANDARD_OPTIONS],
                     TOOLKIT="$withval"
 
                     dnl PORT must be one of the allowed values
-                    if test "$TOOLKIT" != "gtk1" -a "$TOOLKIT" != "gtk2" -a \
+                    if test "$TOOLKIT" != "gtk1" -a "$TOOLKIT" != "gtk2" -a "$TOOLKIT" != "gtk3" -a \
                             "$TOOLKIT" != "msw" -a "$TOOLKIT" != "motif" -a \
                             "$TOOLKIT" != "osx_carbon" -a "$TOOLKIT" != "osx_cocoa" -a \
                             "$TOOLKIT" != "dfb" -a "$TOOLKIT" != "x11"; then
                         AC_MSG_ERROR([
-    Unrecognized option value (allowed values: auto, gtk1, gtk2, msw, motif, osx_carbon, osx_cocoa, dfb, x11)
+    Unrecognized option value (allowed values: auto, gtk1, gtk2, gtk3, msw, motif, osx_carbon, osx_cocoa, dfb, x11)
                         ])
                     fi
 
@@ -866,6 +866,7 @@ AC_DEFUN([WX_DETECT_STANDARD_OPTION_VALUES],
 
             WX_GTKPORT1=$(expr "$WX_SELECTEDCONFIG" : ".*gtk1.*")
             WX_GTKPORT2=$(expr "$WX_SELECTEDCONFIG" : ".*gtk2.*")
+            WX_GTKPORT3=$(expr "$WX_SELECTEDCONFIG" : ".*gtk3.*")
             WX_MSWPORT=$(expr "$WX_SELECTEDCONFIG" : ".*msw.*")
             WX_MOTIFPORT=$(expr "$WX_SELECTEDCONFIG" : ".*motif.*")
             WX_OSXCOCOAPORT=$(expr "$WX_SELECTEDCONFIG" : ".*osx_cocoa.*")
@@ -876,6 +877,7 @@ AC_DEFUN([WX_DETECT_STANDARD_OPTION_VALUES],
             WX_PORT="unknown"
             if test "$WX_GTKPORT1" != "0"; then WX_PORT="gtk1"; fi
             if test "$WX_GTKPORT2" != "0"; then WX_PORT="gtk2"; fi
+            if test "$WX_GTKPORT3" != "0"; then WX_PORT="gtk3"; fi
             if test "$WX_MSWPORT" != "0"; then WX_PORT="msw"; fi
             if test "$WX_MOTIFPORT" != "0"; then WX_PORT="motif"; fi
             if test "$WX_OSXCOCOAPORT" != "0"; then WX_PORT="osx_cocoa"; fi