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diff --git a/m4/ax_prog_flex_version.m4 b/m4/ax_prog_flex_version.m4
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+# SYNOPSIS
+#
+#   AX_PROG_FLEX_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
+#
+# DESCRIPTION
+#
+#   Makes sure that flex version is greater or equal to the version indicated.
+#   If true the shell commands in ACTION-IF-TRUE are executed. If not the shell
+#   commands in commands in ACTION-IF-TRUE are executed. If not the shell
+#   commands in ACTION-IF-FALSE are run. Note if $FLEX is not set (for example
+#   by running AC_CHECK_PROG or AC_PATH_PROG) the macro will fail.
+#
+#   Example:
+#
+#     AC_PATH_PROG([FLEX],[flex])
+#     AX_PROG_FLEX_VERSION([2.5.39],[ ... ],[ ... ])
+#
+#   This will check to make sure that the flex you have is at least
+#   version 2.5.39 or greater.
+#
+#   NOTE: This macro uses the $FLEX variable to perform the check.
+#
+# LICENSE
+#
+#   Copyright (c) 2015 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 1
+
+AC_DEFUN([AX_PROG_FLEX_VERSION],[
+    AC_REQUIRE([AC_PROG_SED])
+    AC_REQUIRE([AC_PROG_GREP])
+
+    AS_IF([test -n "$FLEX"],[
+        ax_flex_version="$1"
+
+        AC_MSG_CHECKING([for flex version])
+        changequote(<<,>>)
+        flex_version=`$FLEX --version 2>&1 \
+          | $SED -n -e '/flex /b inspect
+b
+: inspect
+s/.* (\{0,1\}\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\}.*/\1/;p'`
+        changequote([,])
+        AC_MSG_RESULT($flex_version)
+
+	AC_SUBST([FLEX_VERSION],[$flex_version])
+
+        AX_COMPARE_VERSION([$flex_version],[ge],[$ax_flex_version],[
+	    :
+            $2
+        ],[
+	    :
+            $3
+        ])
+    ],[
+        AC_MSG_WARN([could not find flex])
+        $3
+    ])
+])