* README: Mention GNU m4 1.4 bugs and Akim's patched version.

[bison.git] / README

diff --git a/README b/README
index 8d2153be3d5e673a354cb6b9530d03d12a10624a..75dcf6b543629c210bd4c239fec256b1518c86be 100644 (file)
--- a/README
+++ b/README
@@ -1,8 +1,15 @@
 This directory contains the Bison parser generator.
 
-See the file INSTALL for compilation and installation instructions.
+See the file INSTALL for generic compilation and installation instructions.
 See the file doc/FAQ for frequently asked questions.
 
+Bison requires GNU m4 1.4 or later.  Vanilla GNU m4 1.4 has some
+serious bugs, so we recommend using m4 1.4 as patched by the standard
+GNU/Linux distributions.  If you're building GNU m4 1.4 from scratch
+we suggest using this version:
+
+http://www.lrde.epita.fr/~akim/download/m4-1.4.tar.gz
+
 Older versions of Sun Forte Developer 6 update 2 have a compiler bug
 that cause "make check" to fail with a "Encounter BINCL entry"
 diagnostic.  To fix the bug, update to the latest set of Solaris and
@@ -23,7 +30,7 @@ not answer, send mail to <help-bison@gnu.org>.
 
 -----
 
-Copyright (C) 1992, 1998, 1999, 2003 Free Software Foundation, Inc.
+Copyright (C) 1992, 1998, 1999, 2003, 2004 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.