Seriously, everyone? More than 90% of config files are simple and can be processed in two lines of code (not counting formatting). Like this...open a file, and parse the lines with a map:

    open( my $config_fh, '< :encoding(UTF-8)', '/some/path/.tofile' ) 
      or die "$0: Can't open config file. $!\n";

    my %creds = map { $_ =~ /(\S+)\s*?:\s*?(\S+)/ } <$config_fh>;
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This will hande those simple key/value config lines:

    key: value
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But at the end of the day, I would also say "standardize on a common CPAN module..."