https://git.ruby-lang.org/ruby.git/commit/?id=954223ebd4

From 954223ebd4229d4ca18ee5b78249c4330473910e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 3 Aug 2019 14:56:41 +0900
Subject: [DOC] mentioned minimum versions of tools [ci skip]


diff --git a/doc/contributing.rdoc b/doc/contributing.rdoc
index 7d39c12..7ca6928 100644
--- a/doc/contributing.rdoc
+++ b/doc/contributing.rdoc
@@ -257,9 +257,9 @@ Install the prerequisite dependencies for building the CRuby interpreter to https://github.com/ruby/ruby/blob/trunk/doc/contributing.rdoc#L257
 run tests.
 
 * C compiler
-* autoconf
-* bison
-* gperf
+* autoconf - 2.67 or later, preferably 2.69.
+* bison - 2.0 or later, preferably 3.4.
+* gperf - 3.0.3 or later, preferably 3.1.
 * ruby - Ruby itself is prerequisite in order to build Ruby from source. It
   can be 1.8.
 
-- 
cgit v0.10.2


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