+# Be paranoid: check for autoconf >= 2.50
+# Some setups have both autoconf 2.13 and 2.5x available through
+# a wrapper script: /usr/bin/autoconf.
+# This wrapper may incorrectly autoselect autoconf 2.50, but it
+# advertises itself as autoconf 2.13.
+# If you have such a setup, invoke this script as:
+# autoconf=autoconf2.50 ./autogen.sh
+for i in autoconf2.50 autoconf-2.50 autoconf false; do
+ version=`$i --version 2>/dev/null | head -n 1 | awk '{print $NF}' | awk -F. '{print $1 * 100 + $2}'`
+ if test "0$version" -ge 250; then
+ autoconf=$i
+ break
+ fi
+done