https://git.ruby-lang.org/ruby.git/commit/?id=6dbc3a2871

From 6dbc3a2871d7f5f96d9ad584601c0d284b078197 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 27 May 2020 23:46:44 +0900
Subject: autoconf may not be available


diff --git a/ext/fiddle/extlibs b/ext/fiddle/extlibs
index d2a2ed3..b991f3b 100644
--- a/ext/fiddle/extlibs
+++ b/ext/fiddle/extlibs
@@ -11,4 +11,4 @@ https://ftp.osuosl.org/pub/blfs/conglomeration/libffi/$(pkg).tar.gz \ https://github.com/ruby/ruby/blob/trunk/ext/fiddle/extlibs#L11
 $(pkg)/config.guess -> /tool/config.guess
 $(pkg)/config.sub -> /tool/config.sub
 
-! chdir: $(pkg)| autoconf
+! chdir: $(pkg)| autoconf || exit 0
-- 
cgit v0.10.2


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