Travis builds with rgbds 0.4.0 from source

.travis.yml

@@ -1,14 +1,14 @@
 language: c
+os:
+  - linux
+  - osx
 install:
   - |-
-    path="$(pwd)"; cd;
-    wget https://github.com/rednex/rgbds/archive/v0.3.3.tar.gz -O rgbds.tar.gz &&
-    tar xf rgbds.tar.gz &&
-    cd rgbds-0.3.3 &&
-    sudo make install &&
-    cd - &&
-    rm -rf rgbds &&
-    cd "$path"
+    ( cd
+        git clone -b v0.4.0 --depth=1 https://github.com/rednex/rgbds
+        sudo make -C rgbds install
+        rm -rf rgbds
+    )
 before_script:
   - |-
     function check_status() {
@@ -19,6 +19,5 @@ before_script:
       fi;
     }
 script:
-  - make -j2
-  - make compare
+  - make -j2 compare
   - check_status