From 6282d93b14b3174f753f772e8737e944482d15b5 Mon Sep 17 00:00:00 2001
From: Stefan Schindler <dns2utf8@estada.ch>
Date: Fri, 9 Aug 2019 21:44:00 +0200
Subject: [PATCH] Add a userfriendly check

---
 Makefile | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 37df362..374561a 100644
--- a/Makefile
+++ b/Makefile
@@ -14,12 +14,17 @@ ifeq ($(KERNEL_VERSION),)
 KERNEL_VERSION=$(shell uname -r)
 endif
 
-all:
+all: check
 	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) modules
 
-install:
+install: check
 	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) modules_install
 	depmod -a
 
 clean:
 	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) clean
+
+check:
+ifeq ($(wildcard /lib/modules/$(KERNEL_VERSION)/build/.),)
+	@echo "did you install the \"linux-headers\" package?"
+endif