--- configure.in.orig	Wed Aug 15 07:45:19 2012
+++ configure.in	Mon Feb  4 13:38:41 2013
@@ -740,6 +740,12 @@ if test "x$xc_with_tcl" != "x" ; then
 fi
 
 if test "x$xc_with_tcl" != "x" ; then
+  # Tcl and Tk's lib versions can differ on some systems
+  case $target in
+     *-openbsd*)
+	SHDLIB_EXT=".so.${TK_LIB_FILE##*.so.}"
+	;;
+  esac
   if test "x${xc_with_tk_libraries}" != "x" ; then
     for libname in \
      "${xc_with_tk_libraries}/lib${TK_LIB_NAME}${SHDLIB_EXT}"