--- libsrc/csg/Makefile.am.orig	2014-08-29 09:54:06 UTC
+++ libsrc/csg/Makefile.am
@@ -5,7 +5,7 @@ polyhedra.hpp specpoin.hpp csg.hpp expli
 revolution.hpp spline3d.hpp vscsg.hpp
 
 
-AM_CPPFLAGS = -I$(top_srcdir)/libsrc/include  $(TCL_INCLUDES)
+AM_CPPFLAGS = -I$(top_srcdir)/libsrc/include  $(TCL_INCLUDES) $(TK_INCLUDES)
 METASOURCES = AUTO
 
 lib_LTLIBRARIES = libcsg.la