Log Message:
Import pkgtasks-1-1.9 as pkgsrc/pkgtools/pkgtasks.

pkgtasks is a shell script library to ease writing POSIX-compliant
shell scripts to handle common tasks during installation or removal
of a package, e.g.,

  * creating groups and users needed by the package

  * creating and removing directories with special permissions and
    ownership,

  * copying example config files to their final locations during
    package installation, and removing them during package removal
    if they don't differ from the example ones,

  * reminding the user of files that may be customized after
    package installation.