https://git.ruby-lang.org/ruby.git/commit/?id=05711adfb4

From 05711adfb4eb30975860749225ddee3484336654 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 9 Feb 2020 15:33:28 +0900
Subject: [ruby/readline-ext] Remove unnecessary -I$(top_srcdir) when it's an
 individual gem

https://github.com/ruby/readline-ext/commit/efaca4a5f4

diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index fcc6292..d3e7872 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -109,5 +109,4 @@ unless readline.have_type("rl_hook_func_t*") https://github.com/ruby/ruby/blob/trunk/ext/readline/extconf.rb#L109
   $defs << "-Drl_hook_func_t=Function"
 end
 
-$INCFLAGS << " -I$(top_srcdir)"
 create_makefile("readline")
-- 
cgit v0.10.2


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