it was the update to our Travis image in PR 4622 that caused this -- the S3 uploaded build for
9e7a8d0d4ca51bbf1cbcb9b64351bda699792cb7 has these extra libraries, but the build for
7c40ea6dfb73d40b65c7e260a46e6884a6b76a36, immediately after the change, does not.
-brian