Finding directory of a file

Edward Diener via Boost-build <[email protected]> Fri, 6 Mar 2020 21:56:27 -0500
Newsgroups gmane.comp.lib.boost.build
Message-ID <[email protected]>
Given a filename with no path, how can I find the directory of that 
file, starting my search from some specified directory, in Boost Build ?

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