I took a look at the source of OpenGL, and it appears that glpOpenWindow is a wrapper around glpcOpenWindow. However, if I modify your code slightly to call glpcOpenWindow directly,

#!/usr/bin/env perl

use strict;
use warnings;

use OpenGL;
sub glInit {
    OpenGL::glpcOpenWindow();
}

glInit();
print "Press return to exit\n";
while ( <> ) {
  exit;
}
[download]

Your vendor has not defined OpenGL macro glpcOpenWindow, used at t2.pl
+ line 8.
[download]

By the way, I'm on a Mac (running OS X 10.11, El Capitan).

I found a couple threads that seem to encounter a similar problem:

• perl/TK and OpenGL
• http://stackoverflow.com/questions/24989072/first-time-in-perl-opengl

I gave up trying to get variations of your code to work, but I found a good site with working perl OpenGL examples here: http://nehe.gamedev.net/tutorial/lessons_01__05/22004/. I downloaded and ran the perl code for the first two lessons, and they both worked (the download links are at the bottom of each lesson page).

• Lesson 1: Setting Up An OpenGL Window
• Lesson 2: Your First Polygon

Perhaps those examples will be helpful.

Update: I made some minor formatting edits.