diff -up iaxclient-2.1beta3/configure.ac.gtk3 iaxclient-2.1beta3/configure.ac
--- iaxclient-2.1beta3/configure.ac.gtk3	2019-10-28 22:42:59.089493180 -0400
+++ iaxclient-2.1beta3/configure.ac	2019-10-28 22:54:19.872681275 -0400
@@ -180,8 +180,8 @@ PKG_CHECK_MODULES(SPEEXDSP, [speexdsp >=
 ]))
 
 PKG_CHECK_MODULES(SDL, [sdl >= 1.2], has_sdl=yes, has_sdl=no)
-PKG_CHECK_MODULES(GTK, [gtk+-2.0 >= 2.0], has_gtk2=yes, has_gtk2=no)
-PKG_CHECK_MODULES(GDK2, [gdk-2.0 >= 2.0.0], has_gdk2=yes, has_gdk2=no)
+PKG_CHECK_MODULES(GTK, [gtk+-3.0 >= 3.0], has_gtk2=yes, has_gtk2=no)
+PKG_CHECK_MODULES(GDK2, [gdk-3.0 >= 3.0.0], has_gdk2=yes, has_gdk2=no)
 PKG_CHECK_MODULES(ALSA, [alsa >= 1.0], has_alsa=yes, has_alsa=no)
 PKG_CHECK_MODULES(OGG, [ogg >= 1.1.3], has_ogg=yes, has_ogg=no)
 PKG_CHECK_MODULES(OGGZ, [oggz >= 0.9.5], has_oggz=yes, has_oggz=no)
diff -up iaxclient-2.1beta3/simpleclient/iaxcomm/frame.cc.gtk3 iaxclient-2.1beta3/simpleclient/iaxcomm/frame.cc
--- iaxclient-2.1beta3/simpleclient/iaxcomm/frame.cc.gtk3	2019-10-28 22:42:59.072493076 -0400
+++ iaxclient-2.1beta3/simpleclient/iaxcomm/frame.cc	2019-10-28 23:01:48.424464563 -0400
@@ -230,7 +230,6 @@ MyFrame::MyFrame(wxWindow *parent)
     attr.height = 0;
     attr.wclass = GDK_INPUT_ONLY;
     attr.visual = NULL;
-    attr.colormap = NULL;
     attr.event_mask = 0;
     keyStateWindow = gdk_window_new(NULL, &attr, 0);
 #endif