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  1. or download this
    C:\Perl\cpan\build\YAML-0.58>perl Makefile.PL
    Undefined subroutine &ActivePerl::Config::find_prog called at C:/Perl/
    +site/lib/ActivePerl/Config.pm line 70.
    ...
    Global symbol "$Verbose" requires explicit package name at C:/Perl/lib
    +/ExtUtils/MM_Any.pm line 1277.
    Compilation failed in require at C:/Perl/lib/ExtUtils/MM_Unix.pm line 
    +25.
    Compilation failed in require at inc/Module/Install/Metadata.pm - /Use
    +rs/ingy/local/lib/perl5/site_perl/5.8.6/Module/Install/Metadata.pm li
    +ne 197.
    
  2. or download this
    use ActiveState::Path qw(find_prog realpath);
    
  3. or download this
     
    use base 'Exporter';
    our @EXPORT_OK = qw(path_list find_prog is_abs_path abs_path join_path
    + rel_path unsymlinked realpath);