Federico Ficarelli b594f89d5e Treat tcl as extendable (#7410) ... * Make tcl package extendable * Let tk extend tcl * Fix environment for Tcl extensions		2018-03-13 10:31:03 +09:00
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spack	Treat tcl as extendable (#7410)	2018-03-13 10:31:03 +09:00