From 6492e2509a1c684568871f8cd766e4963265bcec Mon Sep 17 00:00:00 2001
From: "John M. Penn" <john.m.penn@nasa.gov>
Date: Fri, 4 Sep 2015 11:01:48 -0500
Subject: [PATCH] Add check that TRICK_HOME is set in S_overrides.mk.

---
 trick_sims/SIM_cannon_aero/S_overrides.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/trick_sims/SIM_cannon_aero/S_overrides.mk b/trick_sims/SIM_cannon_aero/S_overrides.mk
index 086e38ff..20183fb2 100644
--- a/trick_sims/SIM_cannon_aero/S_overrides.mk
+++ b/trick_sims/SIM_cannon_aero/S_overrides.mk
@@ -1,2 +1,5 @@
+ifndef TRICK_HOME
+    $(error TRICK_HOME environment variable is not set. Please set it and retry.)
+endif
 TRICK_CFLAGS += -I${TRICK_HOME}/trick_models
 TRICK_CXXFLAGS += -I${TRICK_HOME}/trick_models