The book Advanced Perl Programming by Sriram Srinivasan contains a perl script to display the content of man pages in a TK window. When attempting to run the script under the current cygwin, using its version of perl, TK, X, etc. I get a stack dump: 
$ perlman.pl
Scouting man directories
Starting UI ...Tk::Error: Can't set -activebackground to `undef' for T
+k::Menu=HASH(0x103a7ad0): Cannot use undef value for object of type '
+border' at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Configure.p
+m line 46.
 at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 294
 Tk callback for .
 Tk callback for .frame
 Tk::Derived::configure at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin
+/Tk/Derived.pm line 306
 Tk::Widget::new at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Wid
+get.pm line 205
 Tk::Widget::__ANON__ at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/T
+k/Widget.pm line 256
 Tk::Menubutton::menu at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/T
+k/Menubutton.pm line 348
 Tk::Menubutton::separator at /usr/lib/perl5/vendor_perl/5.10/i686-cyg
+win/Tk/Menubutton.pm line 358
 main::create_ui at script/perlman.pl line 105
Can't set -activebackground to `undef' for Tk::Menu=HASH(0x103a7ad0): 
+Cannot use undef value for object of type 'border' at /usr/lib/perl5/
+vendor_perl/5.10/i686-cygwin/Tk/Configure.pm line 46.
 at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 294

 at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 306

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However, when invoked through the debugger the script runs just fine: 
$ perl -d perlman.pl

Loading DB routines from perl5db.pl version 1.3
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(perlman.pl:8):    print STDERR "Scouting man directories\n";
  DB<1> c
Scouting man directories
Starting UI ...Done

[download]
...after which the Perlman window appears.

Any ideas?

In reply to perlman.pl only works in the debugger under cygwin by diamond

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