Lets install the include header and private header files into 
usr/include/tcl8.6 when version of tcl is 8.6.x

Upstream-Status: Inappropriate [Configuration Specific]

Signed-off-by: Khem Raj <raj.khem@gmai.com>

Index: unix/Makefile.in
===================================================================
--- unix.orig/Makefile.in	2013-11-11 01:00:36.431550403 -0800
+++ unix/Makefile.in	2013-11-11 01:05:09.587557282 -0800
@@ -53,7 +53,7 @@
 SCRIPT_INSTALL_DIR	= $(INSTALL_ROOT)$(TCL_LIBRARY)
 
 # Directory in which to install the include file tcl.h:
-INCLUDE_INSTALL_DIR	= $(INSTALL_ROOT)$(includedir)
+INCLUDE_INSTALL_DIR	= $(INSTALL_ROOT)$(includedir)/tcl$(VERSION)
 
 # Path to the private tcl header dir:
 PRIVATE_INCLUDE_DIR	= @PRIVATE_INCLUDE_DIR@
Index: unix/configure.in
===================================================================
--- unix.orig/configure.in	2013-11-11 01:00:36.467550403 -0800
+++ unix/configure.in	2013-11-11 01:00:36.503550404 -0800
@@ -791,7 +791,7 @@
 eval "TCL_LIB_FILE=${TCL_LIB_FILE}"
 
 TCL_LIBRARY='$(libdir)/tcl$(VERSION)'
-PRIVATE_INCLUDE_DIR='$(includedir)'
+PRIVATE_INCLUDE_DIR='$(includedir)/tcl$(VERSION)'
 HTML_DIR='$(DISTDIR)/html'
 
 # Note:  in the following variable, it's important to use the absolute
Index: unix/configure
===================================================================
--- unix.orig/configure	2013-11-11 01:00:36.467550403 -0800
+++ unix/configure	2013-11-11 01:00:36.503550404 -0800
@@ -19134,7 +19134,7 @@
 eval "TCL_LIB_FILE=${TCL_LIB_FILE}"
 
 TCL_LIBRARY='$(libdir)/tcl$(VERSION)'
-PRIVATE_INCLUDE_DIR='$(includedir)'
+PRIVATE_INCLUDE_DIR='$(includedir)/tcl$(VERSION)'
 HTML_DIR='$(DISTDIR)/html'
 
 # Note:  in the following variable, it's important to use the absolute