--- latexmk.pl.orig	Thu Jan 19 15:52:57 2017
+++ latexmk.pl	Fri Feb 24 10:36:01 2017
@@ -978,6 +978,10 @@ else {
         $lpr_pdf  = 'lpr %O %S';
         $pscmd = "ps -ww -u $ENV{USER}"; 
     }
+    elsif ( $^O eq "openbsd" ) {
+        $pscmd = "ps -ww -U $ENV{USER}";
+        $pid_position = 0;
+    }
 }
 
 ## default parameters