try adding multi-os builds

.travis.yml

@@ -1,15 +1,20 @@
 language: cpp
-before_install:
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq libboost-all-dev
-script: cmake . && make
+os:
+- linux
+- osx
 compiler:
-  - clang
-  - gcc
-
+- clang
+- gcc
+before_install:
+- if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get update -qq && sudo apt-get install libboost-dev-all; fi
+- if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update && brew install boost; fi
+script: cmake . && make
+matrix:
+  allow_failures:
+  - os: osx
 env:
   global:
-    - secure: "O+BGqz4ugoVIJbQTh0dJjKRrsSVzkCYSe0WpRzEWK3l8Mw7hqX300g81TxRwTzN2zfUsROMzaeGaXWfGzYakgW59K1WIioaczxtv2MzzUQTbqzJPa+qQoP9bk/b2wJ5jcOL965/rudRju4UiIwuIgzDAMN3nAfIEJgV/2zANLIg="
+  - secure: "O+BGqz4ugoVIJbQTh0dJjKRrsSVzkCYSe0WpRzEWK3l8Mw7hqX300g81TxRwTzN2zfUsROMzaeGaXWfGzYakgW59K1WIioaczxtv2MzzUQTbqzJPa+qQoP9bk/b2wJ5jcOL965/rudRju4UiIwuIgzDAMN3nAfIEJgV/2zANLIg="
 addons:
   coverity_scan:
     project:
@@ -17,5 +22,5 @@ addons:
       description: "Principled, lightweight C/C++ PE parser"
     notification_email: dan@trailofbits.com
     build_command_prepend: "cmake ."
-    build_command:   "make"
+    build_command: "make"
     branch_pattern: master