From root@CC45253-B.lwmrn1.pa.home.com

#!/usr/bin/perl -w
#
# ok, this code *should* work - for some reason, Tk does not seem
# load properly at run time. This code was designed to first see
# if it is an X environment, then if so load Tk at run time. As
# far as I can tell, it loads Tk and does import the symbols, but
# it just breezes through MainLoop - is this a perl thing or
# a Tk thing?
#
# - ben kennedy (bkennedy99@​Home.com)

if ($ENV{DISPLAY}) { # lets see if they even want Tk
  print "Ok, checking for TK\n"; # check to see if Tk is installed;
  eval { require Tk; }; # change to Tk2 to confirm this works
  if ($@​) { # uh oh
  print "Tk not installed!\n";
  exit;
  }
  print "Tk installed\n"; # yay
  Tk->import(); # import routines (yes I read the FAQ)
} else {
  print "No display, returning\n"; # not a X enviro
  exit;
}

# use Tk; # uncomment this to see the below code actually work right

my $mw = new MainWindow; # change this to MainWindbleh to confirm that
  # this is indeed a valid function
$mw->Button(-text => "unF!", -command => sub { exit; })->pack();
MainLoop;

print "Oh no!\n";

Site configuration information for perl 5.00503​:

Configured by root at Mon Aug 30 23​:08​:56 EDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration​:
  Platform​:
  osname=linux, osvers=2.2.5-22smp, archname=i386-linux
  uname='linux porky.devel.redhat.com 2.2.5-22smp #1 smp wed jun 2 09​:11​:51 edt 1999 i686 unknown '
  hint=recommended, useposix=true, d_sigaction=define
  usethreads=undef useperlio=undef d_sfio=undef
  Compiler​:
  cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
  cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
  ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
  stdchar='char', d_stdstdio=undef, usevfork=false
  intsize=4, longsize=4, ptrsize=4, doublesize=8
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
  alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib
  libs=-lnsl -ldl -lm -lc -lposix -lcrypt
  libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
  cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches​:
 

@​INC for perl 5.00503​:
  /usr/lib/perl5/5.00503/i386-linux
  /usr/lib/perl5/5.00503
  /usr/lib/perl5/site_perl/5.005/i386-linux
  /usr/lib/perl5/site_perl/5.005
  .

Environment for perl 5.00503​:
  HOME=/root
  LANG=en_US
  LANGUAGE (unset)
  LC_ALL=en_US
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/usr/local/bin​:/bin​:/usr/bin​:/usr/X11R6/bin​:/usr/sbin​:/usr/local/bin​:/home/tikiman/bin
  PERL_BADLANG (unset)
  SHELL=/bin/bash

From @petdance

This is a 4-year-old issue about a non-core module.

@petdance - Status changed from 'open' to 'rejected'