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perl Makefile.PL # Maybe some option here? os=all|Linux|AIX|RHEL|Suse
make             # To get everything or things covered with option
...
make AIX         # To get Base plus AIX.pm
make test        # To test all related tests
make install     # To install only selected modules

CONFIGURE

...
    reference. The hash may contain further attributes,
    e.g. {LIBS => ...}, that have to be determined by some
    evaluation method.

sub MY::postamble {
    return <<'MAKE_FRAG';
...
    cd sdbm && $(MAKE) all
    MAKE_FRAG
}