+# Use the slower sudo-enabled VMs instead of fast containers:
+# - Package 'djvulibre-bin' is not yet whitelisted for trusty containers.
+# https://github.com/travis-ci/apt-package-whitelist/issues/4036
+sudo: required
+# Use Trusty instead of Travis default (precise)
+# - Required in order to use HHVM 3.6 or higher.
+# - Required for non-buggy xml library for XmlTypeCheck/UploadBaseTest (T75176).
+dist: trusty