From 4147e917d610f793ec14f7bf4ffc82c3b4c92dab Mon Sep 17 00:00:00 2001
From: rofl0r <rofl0r@users.noreply.github.com>
Date: Sat, 13 Feb 2021 09:53:55 +0000
Subject: [PATCH] configure: check whether gperf is compatible

closes #337
---
 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index 00f7f0e..3849383 100644
--- a/configure.ac
+++ b/configure.ac
@@ -210,7 +210,14 @@ AH_TEMPLATE([HAVE_GPERF],
 	    [Whether you have gperf installed for faster config parsing.])
 
 if test "x$GPERF" != "x" -a "x$GPERF" != "xno" ; then
+  AS_ECHO_N(["checking whether gperf is recent enough... "])
+  if "$GPERF" < src/conf-tokens.gperf >/dev/null 2>&1 ; then
+    AS_ECHO("yes")
     AC_DEFINE(HAVE_GPERF)
+  else
+    AM_CONDITIONAL(HAVE_GPERF, false)
+    AS_ECHO("no")
+  fi
 fi
 
 AC_CONFIG_FILES([