Mention the versions of bison and flex.

af49036a · Per Cederqvist · 150a109e · af49036a
Commit af49036a authored May 23, 1999 by Per Cederqvist
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@@ -43,6 +43,14 @@ Perl 5.005_02

 The perl version should not matter.

+Bison and flex
+--------------
+
+You may need the Gnu tools bison and flex. The standard lex and yacc
+are not flexible enough. You should have bison version 1.25 or later
+and flex version 2.5.4 or later.
+
+


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