https://git.ruby-lang.org/ruby.git/commit/?id=4b6fd8329b

From 4b6fd8329b46701414aba2eeca10013cf66ec513 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 2 Jan 2021 11:16:45 +0900
Subject: mkmf.rb: always try_compile as try_header

Get rid of "present but cannot be compiled" headers, on some
multi-architecture platforms.

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index d4fbabe..488f787 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -616,7 +616,7 @@ MSG https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L616
     MakeMakefile.rm_f "#{CONFTEST}*"
   end
 
-  alias_method :try_header, (config_string('try_header') || :try_cpp)
+  alias try_header try_compile
 
   def cpp_include(header)
     if header
-- 
cgit v0.10.2


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