find_flex.sh
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			#!/bin/sh


			FLEX=`which flex35 2>/dev/null \|\| which flex 2>/dev/null`
			if [ $? -ne 0 ]
			then
			echo "ERROR: 'flex' is not installed on this system." 1>&2;
			exit 1;
			fi

			FLEXVERSION=`"$FLEX" --version`

			if [[ $FLEXVERSION == "flex 2.5.4" ]]
			then
			echo "ERROR: the version of flex on this system is too old." 1>&2
			echo "Upgrade to at least 2.5.35 (which is NEWER than 2.5.4)." 1>&2
			exit 1;
			fi

			if [[ $FLEXVERSION != "flex 2.5.35" ]]
			then
			echo "WARNING: the version of flex on this system may be incorrect." 1>&2
			echo "If you receive errors, try upgrading to 2.5.35 or newer." 1>&2
			fi

			echo $FLEX

libphutil/support/xhpast/find_flex.sh196faec15d83stable