From f40c5faffa5f6ee87c6bd48f6ce921ac9d27c3e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Fri, 21 Oct 2016 14:24:00 +0200
Subject: Deprecate Make 3

A warning will be displayed for the time being while we keep
compatibility.

Also improves installation docs for Unix.
---
 core/core.mk | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'core/core.mk')

diff --git a/core/core.mk b/core/core.mk
index f4a8921..96b1457 100644
--- a/core/core.mk
+++ b/core/core.mk
@@ -18,6 +18,16 @@ ERLANG_MK_FILENAME := $(realpath $(lastword $(MAKEFILE_LIST)))
 
 ERLANG_MK_VERSION = 1
 
+# Make 3.81 and 3.82 are deprecated.
+
+ifeq ($(MAKE_VERSION),3.81)
+$(warning Please upgrade to GNU Make 4 or later: https://erlang.mk/guide/installation.html)
+endif
+
+ifeq ($(MAKE_VERSION),3.82)
+$(warning Please upgrade to GNU Make 4 or later: https://erlang.mk/guide/installation.html)
+endif
+
 # Core configuration.
 
 PROJECT ?= $(notdir $(CURDIR))
-- 
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