From 086bb02c240827b530b8ea395fc9b5444e06806d Mon Sep 17 00:00:00 2001
From: Yunsup Lee <yunsup@cs.berkeley.edu>
Date: Thu, 11 Sep 2014 02:38:21 -0700
Subject: [PATCH] check RISCV envirnoment variable

---
 Makefrag | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefrag b/Makefrag
index 41df2cc4..1cac0ceb 100644
--- a/Makefrag
+++ b/Makefrag
@@ -1,6 +1,11 @@
 # UCB use only
 -include $(base_dir)/Makefrag-refchip
 
+# check RISCV environment variable
+ifndef RISCV
+$(error Please set environment variable RISCV. Please take a look at README)
+endif
+
 MODEL := Top
 CXX := g++
 CXXFLAGS := -O1