From d207672bd57bdc0c7a410e2d81c993675e2df59c Mon Sep 17 00:00:00 2001
From: Akinori MUSHA <knu@idaemons.org>
Date: Thu, 12 Apr 2018 17:09:08 +0900
Subject: [PATCH] Parse the output of `go version` to get the value of GOOS
 (#1260)

---
 Makefile | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index 5c15f69d..22992170 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,5 @@
 ifndef GOOS
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Darwin)
-	GOOS := darwin
-else ifeq ($(UNAME_S),Linux)
-	GOOS := linux
-else
-$(error "$$GOOS is not defined.")
-endif
+GOOS        := $(word 1, $(subst /, " ", $(word 4, $(shell go version))))
 endif
 
 MAKEFILE    := $(realpath $(lastword $(MAKEFILE_LIST)))