From 6a8222ebf5e9739ce01dfbddc3ab512376d0b88a Mon Sep 17 00:00:00 2001
From: Thomas Axelsson <thomasa88@gmail.com>
Date: Wed, 8 Jan 2014 22:29:55 +0100
Subject: [PATCH] Makefile: Test multiple AVR roots for Linux and error out if
 none found

Inspired by thors@github.

This should find correct paths for at least Arch, Debian, Fedora, Gentoo, OpenSUSE, Ubuntu.
---
 Makefile.common | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile.common b/Makefile.common
index 3976b65..0477af2 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -55,7 +55,11 @@ IPATH		+= /opt/local/include
 LFLAGS		= -L/opt/local/lib/
 endif
 else
-AVR_ROOT 	:= /usr/lib/avr
+LINUX_AVR_ROOTS := /usr/lib/avr /usr/avr /opt/cross/avr/avr
+AVR_ROOT := $(firstword $(wildcard $(LINUX_AVR_ROOTS)))
+ifeq (${AVR_ROOT},)
+$(error No avr-libc root directory found. Tried the following paths: $(LINUX_AVR_ROOTS))
+endif
 AVR_INC 	:= ${AVR_ROOT}
 AVR 		:= avr-
 
-- 
2.39.5