diff --git a/.travis.yml b/.travis.yml
index 332bd52..36c1b69 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,10 @@ otp_release:
   - 21.2
   - 21.0
   - 20.0
-  - 19.0
-  - 18.0
-  - 17.4
-  - 17.0
-  - R16B
-  - R15B03
+	#  - 19.0
+	#  - 18.0
+	#  - 17.4
+	#  - 17.0
+	#  - R16B
+	#  - R15B03
 before_script: "sudo apt-get --yes --force-yes install libpam-runtime python-software-properties software-properties-common"
diff --git a/Makefile b/Makefile
index e94d5d0..4ba8012 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,11 @@
+REBAR_PATH = $(shell which rebar3)
+
+ifeq ($(REBAR_PATH),)
 REBAR = $(shell pwd)/rebar3
+else
+REBAR = rebar3
+endif
+
 
 all: compile