https://git.ruby-lang.org/ruby.git/commit/?id=8bee9e5cd5

From 8bee9e5cd5e806f94fa727fa58a85effae908c57 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 10 Jun 2020 09:52:54 +0900
Subject: doc/contributing.rdoc: Now ruby >= 2.2 or 2.3 is required to build
 ruby


diff --git a/doc/contributing.rdoc b/doc/contributing.rdoc
index b188093..c00de39 100644
--- a/doc/contributing.rdoc
+++ b/doc/contributing.rdoc
@@ -260,8 +260,8 @@ run tests. https://github.com/ruby/ruby/blob/trunk/doc/contributing.rdoc#L260
 * 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.
+* ruby - Ruby itself is prerequisite in order to build Ruby from source.
+  You should use [a maintained version of Ruby](https://www.ruby-lang.org/en/downloads/).
 
 You should also have access to development headers for the following
 libraries, but these are not required:
-- 
cgit v0.10.2


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