https://git.ruby-lang.org/ruby.git/commit/?id=2a3f45bdb3

From 2a3f45bdb39c750e6f55525151cf3f9a5d727617 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 29 Mar 2020 17:43:24 +0900
Subject: Set `gnumake` in GNUmakefile for cygwin

It was moved from defs/gmake.mk at 88f4ebac83a, for use in
dependency rule lines.

diff --git a/cygwin/GNUmakefile.in b/cygwin/GNUmakefile.in
index 192cf43..072be72 100644
--- a/cygwin/GNUmakefile.in
+++ b/cygwin/GNUmakefile.in
@@ -1,3 +1,5 @@ https://github.com/ruby/ruby/blob/trunk/cygwin/GNUmakefile.in#L1
+gnumake = yes
+
 include Makefile
 
 ENABLE_SHARED=@ENABLE_SHARED@
-- 
cgit v0.10.2


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