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This version of konto_check contains a stripped-down version of zlib 1.2.3 for
better support of the unattended smoke test of CPAN testers. This is not the
complete tarball; the directories amiga/, as400/, contrib/, examples/, msdos/,
old/, projects/, qnx/, and win32 are removed.

In Makefile.PL the system is checked, if the zlib development package is installed;
if not, this version of the library is compiled and used.