usage: ./pkgtool.sh [-a nt32|nt64] [-b debug|release] [-i|-r|-s|-t]

                    [<variable name>=<variable override>[ ..]] name

        -a nt32|nt64      Selects 32-bit or 64-bit architecture; defaults to nt64.

        -b debug|release  Selects debug or release build kind; defaults to debug.

        -i                List package variables and dependencies of single named package.

        -r                List reverse dependencies of single named package.

        -s                Enter interactive package build shell environment for single

                          named package; requires a package dump file. If the package

                          has not been built yet or built successfully, it will be rebuilt

                          at build steps up until, by default, the `build' build step and

                          forcibly aborted and dumped prior to enterting the shell.

        -t                Produce tarball of package build root directory and build log

                          file for the purpose of distribution given build failure.

        <variable name>=<variable override>[ ..]

                          Override build variable.