eumm-upgrade is a tool to allow using new features of ExtUtils::MakeMaker without losing compatibility with older versions. It adds compatibility code to Makefile.PL and tries to automatically detect some properties like license, minimum Perl version required and repository used. Just run eumm-upgrade.pl in directory with Makefile.PL. Old file will be copied to Makefile.PL.bak. If you use Github, Internet connection is required. You need to check resulting Makefile.PL manually as transformation is done with regular expressions. If you need to declare number of spaces in indent in Makefile.PL, use following string at start of it (set 'c-basic-offset' to your value): # -*- mode: perl; c-basic-offset: 4; indent-tabs-mode: nil; -*- (c) Alexandr Ciornii