From e637fd1658fbe641d3794fafdd7d38ef21f443a0 Mon Sep 17 00:00:00 2001
From: Francisco Molina <femolina@uc.cl>
Date: Tue, 28 Jan 2020 10:34:48 +0100
Subject: [PATCH] Makefile.include: remove support for make <4

---
 Makefile.include | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Makefile.include b/Makefile.include
index 9b18c6a0fe..f1770191f3 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -1,10 +1,9 @@
 MATCH_MAKE_VERSION = 4.%
 
 ifeq (,$(filter $(MATCH_MAKE_VERSION),$(MAKE_VERSION)))
-  $(warning GNU Make $(MAKE_VERSION) is DEPRECATED in RIOT. Support for \
-	    versions less than $(MATCH_MAKE_VERSION) will be removed in \
-	    release 2020.01. Please upgrade your system to use GNU Make \
-	    $(MATCH_MAKE_VERSION) or later.)
+  $(error GNU Make $(MAKE_VERSION) is not supported by RIOT since release \
+      2020.01. Please upgrade your system to use GNU Make \
+      $(MATCH_MAKE_VERSION) or later.)
 endif
 
 # 'Makefile.include' directory, must be evaluated before other 'include'