Note: This page should probably have more details and be on a bugs/troubleshooting page for openbsd.
umask will cause an incorrect permissions for some perl dirs, created during
cpan usage. As result only you will have access to the required perl libraries. It is importan if you wanna to share those libraries with other users. You need set
umask to default value before execute
The default mask value is S_IWGRP|S_IWOTH (022, write access for the owner only). (