Experiments with declarative apt and OSX.

.travis.yml

@@ -1,5 +1,17 @@
+matrix:
+    include:
+        - os: linux
+        - os: osx
           before_install:
-    - sudo apt-get install ed lua5.1 liblua5.1-posix1 ninja-build
+          - brew update
+addons:
+    apt:
+        packages:
+        - ed
+        - lua5.1
+        - liblua5.1-posix1
+git:
+    depth: 10
 language: c
 script:
     - make PREFIX=/tmp/acki -j4