6.18. Using Tcl/Tk

6.18. Using Tcl/Tk
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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 USES=tcl. It is possible to specify the desired version of tcl by appending :xx, for example, USES=tcl:85.

Table 6.27. The Most Useful Read-Only Variables for Ports That Use Tcl/Tk

`TCL_VER`	chosen major.minor version of Tcl
`TCLSH`	full path of the Tcl interpreter
`TCL_LIBDIR`	path of the Tcl libraries
`TCL_INCLUDEDIR`	path of the Tcl C header files
`TK_VER`	chosen major.minor version of Tk
`WISH`	full path of the Tk interpreter
`TK_LIBDIR`	path of the Tk libraries
`TK_INCLUDEDIR`	path of the Tk C header files

See the USES=tcl and USES=tk of Chapter 17, Using USES Macros for a full description of those variables. A complete list of those variables is available in /usr/ports/Mk/Uses/tcl.mk.

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