$OpenBSD: patch-configure,v 1.3 2012/04/03 16:37:42 sthen Exp $

use '-pthread' instead of '-lpthread'

--- configure.orig	Thu Feb  2 21:24:20 2012
+++ configure	Fri Mar 30 21:27:25 2012
@@ -5912,12 +5912,12 @@ return pthread_create ();
   return 0;
 }
 _ACEOF
-for ac_lib in '' pthread; do
+for ac_lib in pthread; do
   if test -z "$ac_lib"; then
     ac_res="none required"
   else
-    ac_res=-l$ac_lib
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+    ac_res=-$ac_lib
+    LIBS="-$ac_lib  $ac_func_search_save_LIBS"
   fi
   if ac_fn_c_try_link "$LINENO"; then :
   ac_cv_search_pthread_create=$ac_res
@@ -6261,7 +6261,7 @@ $as_echo "#define _GNU_SOURCE 1" >>confdefs.h
 elif test "$GCC" = "yes"
 then
   GCC_VERSION=`$CC -dumpversion`
-  CFLAGS="$CFLAGS -Wall -Werror -pedantic -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls"
+  CFLAGS="$CFLAGS -Wall -Werror -pedantic -Wmissing-prototypes -Wmissing-declarations"
   case $GCC_VERSION in
     4.4.*)
     CFLAGS="$CFLAGS -fno-strict-aliasing"