From 8d56b498d1525ccdfc741ade45ecd3479d158acb Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Tue, 24 Apr 2007 17:03:52 +0000
Subject: [PATCH] Warn if flex is not installed.

git-svn-id: file://localhost/svn/verilator/trunk/verilator@918 77ca24e4-aefa-0310-84f0-b9a241c72d87
---
 Changes      |  4 ++++
 configure.ac | 11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Changes b/Changes
index b3eea44e1..06d184de7 100644
--- a/Changes
+++ b/Changes
@@ -3,6 +3,10 @@ Revision history for Verilator
 The contributors that suggested a given feature are shown in [].  [by ...]
 indicates the contributor was also the author of the fix; Thanks!
 
+* Verilator 3.65**
+
+**** Warn if flex is not installed.  [Ralf Karge]
+
 * Verilator 3.650 4/20/2007
 
 **   Add --compiler msvc option.  This is now required when Verilated code
diff --git a/configure.ac b/configure.ac
index 54b490df4..d1d862151 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,8 +16,17 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_PROG_INSTALL
 AC_PATH_PROG(PERL,perl)
-AC_PATH_PROG(YACC,bison)
+if test "x$PERL" = "x" ; then
+   AC_MSG_ERROR([Cannot find "perl" in your PATH, please install it])
+fi
 AC_PATH_PROG(LEX,flex)
+if test "x$LEX" = "x" ; then
+   AC_MSG_ERROR([Cannot find "flex" in your PATH, please install it])
+fi
+AC_PATH_PROG(YACC,bison)
+if test "x$YACC" = "x" ; then
+   AC_MSG_ERROR([Cannot find "bison" in your PATH, please install it])
+fi
 
 dnl Checks for libraries.