https://git.ruby-lang.org/ruby.git/commit/?id=30268d1de6

From 30268d1de697de4b87ab6c655c4dc244be036900 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 10 Dec 2021 18:39:41 +0900
Subject: Prefer flat_map

---
 lib/mkmf.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 52788ab3abc..118b81314c9 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -285,7 +285,7 @@ MESSAGE https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L285
 
   def split_libs(*strs)
     sep = $mswin ? /\s+/ : /\s+(?=-|\z)/
-    strs.map {|s| s.lstrip.split(sep)}.flatten
+    strs.flat_map {|s| s.lstrip.split(sep)}
   end
 
   def merge_libs(*libs)
@@ -1083,7 +1083,7 @@ SRC https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L1083
   def find_library(lib, func, *paths, &b)
     dir_config(lib)
     lib = with_config(lib+'lib', lib)
-    paths = paths.collect {|path| path.split(File::PATH_SEPARATOR)}.flatten
+    paths = paths.flat_map {|path| path.split(File::PATH_SEPARATOR)}
     checking_for checking_message(func && func.funcall_style, LIBARG%lib) do
       libpath = $LIBPATH
       libs = append_library($libs, lib)
-- 
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