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82d316c6c8
gitk runs under wish so naturally has Tcl and Tk available and of the same version. gitk sets a requirement on Tk version >= 8.4: this is very outdated, and the earliest Tcl currently shipping on any supported OS is 8.6. As 8.7 is in alpha test and is generally compatible with 8.6, we should allow 8.7. Tcl 9.0 has planned compatibility breaking changes so is not yet supported. Let's change the requirements to 8.6-8.7, but not 9.0. Place this at the top of file so the requirements are obvious. Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>