updated for version 7.4.223
Problem:    Still using an older autoconf version.
Solution:   Switch to autoconf 2.69.
diff --git a/src/Makefile b/src/Makefile
index 4e9b5f1..ffa8d24 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -586,6 +586,9 @@
 # as root: sysctl -w vm.max_proc_mmap=30000
 #EXTRA_LIBS = /usr/local/lib/libefence.a
 
+# Autoconf binary.
+AUTOCONF = autoconf
+
 # PURIFY - remove the # to use the "purify" program (hoi Nia++!)
 #PURIFY = purify
 
@@ -1713,7 +1716,7 @@
 # - Uses ">config.log" instead of "./config.log".
 autoconf:
 	if test ! -f configure.save; then mv configure configure.save; fi
-	autoconf
+	$(AUTOCONF)
 	sed -e 's+>config.log+>auto/config.log+' -e 's+\./config.log+auto/config.log+' configure > auto/configure
 	chmod 755 auto/configure
 	mv -f configure.save configure