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-rw-r--r--core/core.mk10
1 files changed, 10 insertions, 0 deletions
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))