#extra linker flags for threaded tk
--- configure.orig	2009-06-03 19:08:21.000000000 -0400
+++ configure	2009-06-03 19:48:48.000000000 -0400
@@ -43400,7 +43400,7 @@
     ## Part 2.  Try finding the tk library.
     if test -n "${TK_CONFIG}"; then
       . ${TK_CONFIG}
-      TCLTK_LIBS="${TCLTK_LIBS} ${TK_LIB_SPEC} ${TK_XLIBSW}"
+      TCLTK_LIBS="${TCLTK_LIBS} ${TK_LIB_SPEC} ${TK_XLIBSW} ${TCL_LD_FLAGS}"
     else
 
 { echo "$as_me:$LINENO: checking for Tk_Init in -ltk" >&5