[Help Request] SUMO_HOME environment variable Error in sanity-test

[zyu494]

High Level Description

I tried to install this simulator on ubuntu 20.04. When I conducting sanity-test, it returns error regarding SUMO_HOME environment variable. I'd like to know how to fix it.

Version

comp-1, smarts-0.6.1

Operating System

ubuntu 20.04

Problems

When I conducting sanity-test, it returns error regarding SUMO_HOME environment variable. I'd like to know how to fix it.

scl scenario build --clean scenarios/sumo/loop
build-scenario scenarios/sumo/loop
scl scenario build --clean scenarios/sumo/zoo_intersection
build-scenario scenarios/sumo/zoo_intersection
./tests/test_setup.py
ERROR: SUMO_HOME environment variable is not set
make: *** [Makefile:23: sanity-test] Error 255

When I use echo $SUMO_HOME, there is no output. But it seems that this issue (#1299) mentioned that SUMO_HOME environment variable no longer needs to be set. So I'd like to know how to fix error.