If the package contains files called PKG_ADD or PKG_DEL the commands in these files will be executed when the package is added or removed from the users path. In some situations such files are a bit cumbersome to maintain, so the package manager supports automatic creation of such files. If a source file in the package contains a PKG_ADD or PKG_DEL directive they will be added to either the PKG_ADD or PKG_DEL files.
In m-files a PKG_ADD directive looks like this
## PKG_ADD: some_octave_command
Such lines should be added before the function keyword. In C++ files a PKG_ADD directive looks like this
// PKG_ADD: some_octave_command
In both cases some_octave_command should be replaced by the command that should be placed in the PKG_ADD file. PKG_DEL directives work in the same way, except the PKG_ADD keyword is replaced with PKG_DEL and the commands get added to the PKG_DEL file.
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/PKG_005fADD-and-PKG_005fDEL-Directives.html