https://git.ruby-lang.org/ruby.git/commit/?id=d1f0d1ca2e

From d1f0d1ca2ea4d7418b096ce71f68ce2bb3afd2c4 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Wed, 25 Aug 2021 16:24:25 +0900
Subject: Fix build failure on macOS with --enable-shared

./spec/ruby/optional/capi/ext/array_spec.c can match with spec/%/ if
using GNU Make under version 3.81. make command installed on macOS is
3.81, so ruby can't be built with default make on macOS with
  --enable-shared option since https://github.com/ruby/ruby/commit/bda56a03a625793cb3fd110458c3f7323d73705e
---
 defs/gmake.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/defs/gmake.mk b/defs/gmake.mk
index 11e677a..7dd24cf 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -360,6 +360,10 @@ spec/bundler/%: PHONY https://github.com/ruby/ruby/blob/trunk/defs/gmake.mk#L360
 spec/bundler: test-bundler-parallel
 	$(Q)$(NULLCMD)
 
+# workaround to avoid matching non ruby files with "spec/%/" under GNU make 3.81
+spec/%_spec.c spec/%_spec.bundle:
+	$(NOOP)
+
 spec/%/ spec/%_spec.rb: programs exts PHONY
 	+$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec-run -B $(srcdir)/spec/default.mspec $(SPECOPTS) $(patsubst %,$(srcdir)/%,$@)
 
-- 
cgit v1.1


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