use if $^O == "WINMS32", Term::ANSIColor => qw(:constants);

That's not quite right.
The condition you want is  $^O eq 'MSWin32'
The condition you've used will generally evaluate as true on all systems because, in numeric context, both $^O and "WINMS32" are generally 0.
If you use warnings you should receive 2 warnings - one about the non-numeric nature of "WINMS32" and one about the non-numeric nature of $^O ("MSWin32").

Also, on perl-5.26.0 at least, I find that if I use strict then I also need to place quotes around Term::ANSIColor.
This is contrary to the if documentation which states:

<quote>
The use of => above provides necessary quoting of MODULE . If you don't use the fat comma (eg you don't have any ARGUMENTS), then you'll need to quote the MODULE.
</quote>

I'll submit a bug report about this oversight in the "if" documentation.

UPDATE: Bug report submitted.

I personally prefer to use "require" to load modules in this type of situation: 
if($^O eq 'MSWin32') {
  require Term::ANSIColor;
  Term::ANSIColor->import(":constants");
}

[download]
Cheers,
Rob

In reply to Re^3: Color in windows command prompt by syphilis
in thread Color in windows command prompt by g_speran

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