diff --git a/configure.in b/configure.in
index e0dad7ec..f7ee7894 100644
--- a/configure.in
+++ b/configure.in
@@ -1,14 +1,14 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.57)
-AC_INIT(lighttpd, 1.3.11, jan@kneschke.de)
+AC_INIT(lighttpd, 1.3.12, jan@kneschke.de)
 AC_CONFIG_SRCDIR([src/server.c])
 
 AC_CANONICAL_TARGET
 
 AM_INIT_AUTOMAKE
 
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADER([config.h])
 
 AM_MAINTAINER_MODE
 
@@ -351,6 +351,9 @@ AC_ARG_ENABLE(lfs,
   esac],[CPPFLAGS="${CPPFLAGS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGE_FILES"])
 AC_MSG_RESULT($enableval)
 
+AC_CHECK_SIZEOF(long)
+AC_CHECK_SIZEOF(off_t)
+
 AM_CONDITIONAL(CROSS_COMPILING, test "x$cross_compiling" = xyes)
 
 dnl check for fastcgi lib, for the tests only