From d5d8285dd676a9940ee351daada4179a01f151fd Mon Sep 17 00:00:00 2001
From: "Thomas E. Dickey" <dickey@his.com>
Date: Fri, 14 Feb 2020 01:26:06 +0000
Subject: issue #4: configure doesn't fail if flex is not installed

add a check for lex like the existing one for yacc

Signed-off-by: Thomas E. Dickey <dickey@invisible-island.net>
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index 985df1a..143d388 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,12 @@ if test ! -f "$srcdir/src/laygram.c"; then
    fi
 fi
 AC_PROG_LEX
+AC_PATH_PROG([LEX_INST], $LEX)
+if test ! -f "$srcdir/src/laylex.c"; then
+   if test -z "$LEX_INST"; then
+      AC_MSG_ERROR([lex not found - unable to compile laylex.y])
+   fi
+fi
 
 # Checks for header files.
 PKG_CHECK_MODULES(X11, [x11 xt xmu xext])
-- 
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