#! perl -slw
use strict;
use threads;
use OpenGL qw[ :all ];

async{ print 'from thread' }->detach;
...

##</code><code>##

c:\test>GLex7.2.pl
Can't locate package GLUquadricObjPtr for @OpenGL::Quad::ISA at c:/Perl/lib/threads.pm line 117.
from thread
display
display
...