From c75001aa7dcc095cb05bd29a08e027b2cae60a44 Mon Sep 17 00:00:00 2001
From: Oswald Buddenhagen <ossi@users.sf.net>
Date: Sun, 15 Oct 2017 11:34:50 +0200
Subject: [PATCH] add check for perl and its version

---
 configure.ac | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/configure.ac b/configure.ac
index c7dcce9..c901352 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,6 +11,23 @@ fi
 
 CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
 
+AC_CHECK_PROG(PERL, perl, perl)
+if test "x$PERL" = "x"; then
+    AC_MSG_ERROR([perl not found])
+fi
+
+need_perl=5.14
+AC_CACHE_CHECK([whether perl is recent enough], ob_cv_perl_ver, [
+    if $PERL -e "use v$need_perl;"; then
+        ob_cv_perl_ver=yes
+    else
+        ob_cv_perl_ver=no
+    fi
+])
+if test "x$ob_cv_perl_ver" = "xno"; then
+    AC_MSG_ERROR([perl is too old])
+fi
+
 AC_CACHE_CHECK([whether strftime supports %z], ob_cv_strftime_z,
     [AC_TRY_RUN(
 [#include <time.h>