diff -ruN squid-3.1.5-orig/acinclude.m4 squid-3.1.5/acinclude.m4
--- squid-3.1.5-orig/acinclude.m4	2010-07-02 04:47:30.000000000 +0200
+++ squid-3.1.5/acinclude.m4	2010-07-25 20:24:04.000000000 +0200
@@ -134,7 +134,7 @@
 dnl   and this notice are preserved.
 dnl
 AC_DEFUN([AX_WITH_PROG],[
-    AC_PREREQ([2.61])
+    AC_PREREQ([2.59])
 
     pushdef([VARIABLE],$1)
     pushdef([EXECUTABLE],$2)
diff -ruN squid-3.1.5-orig/bootstrap.sh squid-3.1.5/bootstrap.sh
--- squid-3.1.5-orig/bootstrap.sh	2010-07-02 04:47:30.000000000 +0200
+++ squid-3.1.5/bootstrap.sh	2010-07-25 20:24:04.000000000 +0200
@@ -7,7 +7,7 @@
 # Autotool versions preferred. To override either edit the script
 # to match the versions you want to use, or set the variables on
 # the command line like "env acver=.. amver=... ./bootstrap.sh"
-acversions="${acver:-2.63 2.62 2.61}"
+acversions="${acver:-2.63 2.62 2.61 2.60 2.59}"
 amversions="${amver:-1.11 1.10 1.9}"
 ltversions="${ltver:-2.2 1.5 1.4}"
 
diff -ruN squid-3.1.5-orig/configure.in squid-3.1.5/configure.in
--- squid-3.1.5-orig/configure.in	2010-07-02 04:48:47.000000000 +0200
+++ squid-3.1.5/configure.in	2010-07-25 20:25:23.000000000 +0200
@@ -3,7 +3,7 @@
 dnl  $Id$
 dnl
 AC_INIT([Squid Web Proxy],[3.1.6],[http://www.squid-cache.org/bugs/],[squid])
-AC_PREREQ(2.61)
+AC_PREREQ(2.59)
 AC_CONFIG_HEADERS([include/autoconf.h])
 AC_CONFIG_AUX_DIR(cfgaux)
 AC_CONFIG_SRCDIR([src/main.cc])