- Use bsd.default-versions.mk to specify the default Tcl/Tk version (8.6)
- Add warnings about the now deprecated use of USE_TCL, USE_TK, ...
Notes:
* USES+=tcl and USES+=tk take the following optional arguments
- either a version in the form of XY or XY+, or 'wrapper' to depend on
lang/tcl-wrapper or x11-toolkits/tk-wrapper
- either 'build' (bring in build depend) or 'run' (bring in run depend)
* it is an error to specify both 'tcl' and 'tk' in USES.
* The functionality currently implemented via INVALID_TCL_VER and
INVALID_TK_VER is not yet available.
Approved by: bapt (portmgr)