From be65cf53253fa955cd4016459b3add3ba6046837 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 16 Nov 2022 11:41:19 +0900
Subject: Remove `-j` option from `MFLAGS` for sub-makes

---
 ext/extmk.rb | 1 +
 1 file changed, 1 insertion(+)

(limited to 'ext/extmk.rb')

diff --git a/ext/extmk.rb b/ext/extmk.rb
index 73ee71fd37..9c12bda919 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -721,6 +721,7 @@ begin
     mf.puts "ECHO1 = $(V:1=@:)"
     mf.puts "ECHO = $(ECHO1:0=@echo)"
     mf.puts "MFLAGS = -$(MAKEFLAGS)" if $nmake
+    mf.puts "override MFLAGS := $(filter-out -j%,$(MFLAGS))" if $gnumake
     mf.puts
 
     def mf.macro(name, values, max = 70)
-- 
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