At https://fedoraproject.org/wiki/Packaging/Tcl I read

Both arch-specific and noarch Tcl extensions MUST use
Requires: tcl(abi) = 8.5

which seems more than a little bizarre when every other part of the page
tells you that you MUST avoid putting hard-wired Tcl version number
dependencies into your specfile. And it also tells you exactly how to
extract the Tcl version dynamically. So why isn't this a better
solution?

Requires: tcl(abi) = %{tcl_version}


regards, tom lane

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