$OpenBSD: patch-acinclude_m4,v 1.2 2011/07/06 15:01:13 dcoppa Exp $
--- acinclude.m4.orig	Wed Aug 20 18:00:01 2008
+++ acinclude.m4	Wed Jul  6 16:58:17 2011
@@ -4419,7 +4419,10 @@ AC_DEFUN([KDE_CHECK_LIBPTHREAD],
 
   dnl Un-special-case for FreeBSD.
   if test "x$LIBPTHREAD" = "xPTHREAD" ; then
-    LIBPTHREAD=""
+    case $host_os in
+	openbsd*) LIBPTHREAD="-pthread" ;;
+	*) LIBPTHREAD="" ;;
+    esac
   fi
 
   AC_SUBST(LIBPTHREAD)
