diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index f7ce02b851..500d7b608f 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -29,6 +29,7 @@
2006
2007
2008
+ 2009
The FreeBSD Documentation
Project
@@ -6599,6 +6600,113 @@ _DOCSDIR= .
+
+ Using <application>Tcl/Tk</application>
+
+ The Ports Collection supports parallel installation of
+ multiple Tcl/Tk versions. Ports
+ should try to support at least the default
+ Tcl/Tk version and higher with the
+ USE_TCL and USE_TK
+ variables. It is possible to specify the desired version of
+ tcl with the WITH_TCL_VER
+ variable.
+
+
+ The most useful variables for ports that use
+ <application>Tcl/Tk</application>
+
+
+
+
+ USE_TCL
+
+ The port depends on the
+ Tcl library (not the shell).
+ Minimal required version can be specified with values
+ such as 84+. Individual unsupported versions can be
+ specified with the INVALID_TCL_VER
+ variable.
+
+
+
+ USE_TCL_BUILD
+
+ The port needs Tcl only
+ during the build time.
+
+
+
+ USE_TCL_WRAPPER
+
+ Ports that requrire the
+ Tcl shell and do not require
+ a specific tclsh version should use
+ this new variable. The tclsh wrapper
+ is installed on the system. The user can specify the
+ desired tcl shell to use.
+
+
+
+ WITH_TCL_VER
+
+ User-defined variable that sets the desired
+ Tcl version.
+
+
+
+ UNIQUENAME_WITH_TCL_VER
+
+ Like WITH_TCL_VER, but
+ per-port.
+
+
+
+ USE_TCL_THREADS
+
+ Require a threaded build of
+ Tcl/Tk.
+
+
+
+ USE_TK
+
+ The port depends on the
+ Tk library (not the wish
+ shell). Implies USE_TCL with the
+ same value. For more information see the description of
+ USE_TCL variable.
+
+
+
+ USE_TK_BUILD
+
+ Analog to the USE_TCL_BUILD
+ variable.
+
+
+
+ USE_TK_WRAPPER
+
+ Analog to the USE_TCL_WRAPPER
+ variable.
+
+
+
+ WITH_TK_VER
+
+ Analog to the WITH_TCL_VER
+ variable and implies WITH_TCL_VER of
+ the same value.
+
+
+
+
+
+ A complete list of available variables can be found in
+ /usr/ports/Mk/bsd.tcl.mk.
+
+
Using Emacs