diff --git a/m4/boinc_wxwidgets.m4 b/m4/boinc_wxwidgets.m4
index 38ecb7ff21..86d66fdd07 100644
--- a/m4/boinc_wxwidgets.m4
+++ b/m4/boinc_wxwidgets.m4
@@ -76,11 +76,11 @@ WARNING: No ${uprf} libraries for wxWidgets are installed.
    AM_CONDITIONAL([GUI_GTK], echo $wx_default_config | grep -i ^gtk 2>&1 >/dev/null)
    if echo $wx_default_config | grep -i gtk 2>&1 >/dev/null ; then
      case ${wx_default_config} in
-        gtk3-*)  gtkver=gtk+-3.0
+        gtk3-*|*-gtk3-*)  gtkver=gtk+-3.0
 	         ;;
-        gtk2-*)  gtkver=gtk+-2.0
+        gtk2-*|*-gtk2-*)  gtkver=gtk+-2.0
 	         ;;
-        gtk-*)   gtkver=gtk+
+        gtk-*|*-gtk-*)    gtkver=gtk+
 	         ;;
       esac
       GTK_CFLAGS="`pkg-config --cflags $gtkver`"