From 4a2a2f41ad444facc9f49e095a44f4fdeff802fc Mon Sep 17 00:00:00 2001
From: Hilko Bengen <bengen@hilluzination.de>
Date: Thu, 21 Nov 2024 13:41:16 +0000
Subject: [PATCH] error out if sed, tar are not the GNU versions.

---
 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index baa3244..1e3519a 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,11 @@ $(if $(filter 4.%,$(MAKE_VERSION)),,\
 	$(error GNU make 4.0 or above is required.))
 
 SED := $(firstword $(shell which gsed sed))
+$(if $(findstring GNU sed,$(shell $(SED) --version)),,\
+	$(error GNU sed is required.))
 TAR := $(firstword $(shell which gtar tar))
+$(if $(findstring GNU tar,$(shell $(TAR) --version)),,\
+	$(error GNU tar is required.))
 
 export GOPATH=$(CURDIR)/_gopath
 export GOCACHE=$(CURDIR)/_gopath/cache