$NetBSD$

--- lib/mkinc.SH.orig	Fri Apr 16 11:59:42 1999
+++ lib/mkinc.SH	Fri May  7 20:50:39 1999
@@ -54,6 +54,8 @@
   if ($ARGV[0] =~ s/^-I//) {
     push @opt_I, $ARGV[0];
     shift;
+  } elsif ($ARGV[0] =~ m/^-O/) {
+    shift;
   } else {
     warn "$0: Unknown option $ARGV[0]\n";
     shift;
