[travis] fix osx build

Summary: Untested code didn't work, surprise!

Reviewed By: mbouaziz

Differential Revision: D13179256

fbshipit-source-id: 30a078242

.travis.yml

@@ -4,7 +4,6 @@ os:
   - linux
   - osx
 services: docker
-osx_image: xcode7.3
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get -qq update; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y aspcud; fi
@@ -12,9 +11,8 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew unlink python; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install opam; fi
 install:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then travis_wait 60 ./build-infer.sh --yes java --user-opam-switch --only-setup-opam; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then eval `opam env`; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then opam install --yes infer .; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then opam init --reinit --no-setup --disable-sandboxing; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then travis_wait 60 opam install --yes .; fi
 script:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then ./.travis/local_install_tests.sh; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then ./.travis/docker_tests.sh; fi