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    <p>This would do it - assuming a Unix-like environment.</p> <pre><code>MKDIR_P = mkdir -p .PHONY: directories all: directories program directories: ${OUT_DIR} ${OUT_DIR}: ${MKDIR_P} ${OUT_DIR} </code></pre> <p>This would have to be run in the top-level directory - or the definition of ${OUT_DIR} would have to be correct relative to where it is run. Of course, if you follow the edicts of Peter Miller's "<a href="https://web.archive.org/web/20150330111905/http://miller.emu.id.au/pmiller/books/rmch/" rel="noreferrer">Recursive Make Considered Harmful</a>" paper, then you'll be running make in the top-level directory anyway.</p> <p>I'm playing with this (RMCH) at the moment. It needed a bit of adaptation to the suite of software that I am using as a test ground. The suite has a dozen separate programs built with source spread across 15 directories, some of it shared. But with a bit of care, it can be done. OTOH, it might not be appropriate for a newbie.</p> <hr> <p>As noted in the comments, listing the 'mkdir' command as the action for 'directories' is wrong. As also noted in the comments, there are other ways to fix the 'do not know how to make output/debug' error that results. One is to remove the dependency on the the 'directories' line. This works because 'mkdir -p' does not generate errors if all the directories it is asked to create already exist. The other is the mechanism shown, which will only attempt to create the directory if it does not exist. The 'as amended' version is what I had in mind last night - but both techniques work (and both have problems if output/debug exists but is a file rather than a directory).</p>
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    1. POCreate directories using make file
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    1. USJoey Dumont
    1. USJonathan Leffler
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    1. COThank you Jonathan. when i tried that i got an error "make: *** No rule to make target `output/debug', needed by `directories'. Stop." But i'm not going to worry about that now. will stick with the basic rules. :). Thank you for guiding. And i'm running "make" from toplevel directory only.
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      1. USJabez
    2. COJust delete the ${OUT_DIR} behind directories:, then it should work.
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      1. USDoc Brown
    3. COIt worked. Thank you Doc.
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