diff --git a/build/buildcheck.sh b/build/buildcheck.sh
index 7db31e2c0ce..6601fc9943c 100755
--- a/build/buildcheck.sh
+++ b/build/buildcheck.sh
@@ -25,18 +25,18 @@ if test -z "$PHP_AUTOCONF"; then
   PHP_AUTOCONF='autoconf'
 fi
 
-# autoconf 2.64 or newer
+# autoconf 2.68 or newer
 ac_version=`$PHP_AUTOCONF --version 2>/dev/null|head -n 1|sed -e 's/^[^0-9]*//' -e 's/[a-z]* *$//'`
 if test -z "$ac_version"; then
 echo "buildconf: autoconf not found."
-echo "           You need autoconf version 2.64 or newer installed"
+echo "           You need autoconf version 2.68 or newer installed"
 echo "           to build PHP from Git."
 exit 1
 fi
 IFS=.; set $ac_version; IFS=' '
-if test "$1" = "2" -a "$2" -lt "64" || test "$1" -lt "2"; then
+if test "$1" = "2" -a "$2" -lt "68" || test "$1" -lt "2"; then
 echo "buildconf: autoconf version $ac_version found."
-echo "           You need autoconf version 2.64 or newer installed"
+echo "           You need autoconf version 2.68 or newer installed"
 echo "           to build PHP from Git."
 exit 1
 else
diff --git a/configure.ac b/configure.ac
index 54144917a23..81c7f9ccc3d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ sinclude(Zend/acinclude.m4)
 dnl Basic autoconf + automake initialization, generation of config.nice.
 dnl -------------------------------------------------------------------------
 
-AC_PREREQ([2.64])
+AC_PREREQ([2.68])
 AC_INIT(README.GIT-RULES)
 ifdef([AC_PRESERVE_HELP_ORDER], [AC_PRESERVE_HELP_ORDER], [])
 
diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index f234e68ea8a..55fa08d7c45 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -1,6 +1,6 @@
 dnl This file becomes configure.ac for self-contained extensions.
 
-AC_PREREQ(2.59)
+AC_PREREQ([2.68])
 AC_INIT(config.m4)
 ifdef([AC_PRESERVE_HELP_ORDER], [AC_PRESERVE_HELP_ORDER], [])