From 6489995bdc9ed50117fd38f5f261334daad63870 Mon Sep 17 00:00:00 2001
From: Cyrille Bagard <nocbos@gmail.com>
Date: Mon, 2 May 2016 09:08:26 +0200
Subject: Warned in case of missing analyzer/parser generator.

---
 ChangeLog    |  5 +++++
 configure.ac | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 7eee7ea..add1e17 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 16-05-02  Cyrille Bagard <nocbos@gmail.com>
 
+	* configure.ac:
+	Warn in case of missing analyzer/parser generator.
+
+16-05-02  Cyrille Bagard <nocbos@gmail.com>
+
 	* src/arch/dalvik/Makefile.am:
 	* src/arch/dalvik/decomp/Makefile.am:
 	* src/decomp/Makefile.am:
diff --git a/configure.ac b/configure.ac
index dc1118a..e8291b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,9 @@ AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_LIBTOOL
 
+AC_PATH_PROG(YACC_INST, $YACC)
+AC_PATH_PROG(LEX_INST, $LEX)
+
 
 #--- Checks for libraries
 
@@ -421,8 +424,24 @@ echo Available Python programming language........ : $python3_version
 echo The Python GObject bindings.................. : $libpygobject_version
 
 echo
+echo Found lexical analyzer generator............. : $LEX_INST
+echo Found general-purpose parser generator....... : $YACC_INST
+
+echo
 echo Print debugging messages..................... : $enable_debug
 
+if test -z "$LEX_INST" -o -z "$YACC_INST"; then
+
+   echo
+
+   m4_define([flex_bison_warning],[m4_joinall([m4_newline([])],
+          [Only code from a release archive can be compiled without analyzer and parser generators.],
+          [If the sources come from a repository snapshot, please install all the requiered dependencies for the software.])])
+
+   AC_MSG_WARN([flex_bison_warning])
+
+fi
+
 echo
 echo configure complete, now type \'make\'
 echo
-- 
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