Makefile --srcdir option

Heime <[email protected]>
Newsgroups gmane.emacs.help
Message-ID <uDg3STgt1HsplMDY-aoHJU_O6m5KiyFw6LwNLExTb-NbdDp2p4m4j4jSPiAIs-hPTpHKHwgyiMoD6tWUxXV3QUDaPLuwkabWqnXj449vMh4=@protonmail.com>
How can I make a --srcdir user option for a makefile that builds
a package documentation.  And what would customarily be the default
source directory: a . or a fullpath?
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