FYI to all it seems like the best way to use QT5 is now to use the apparently experimental feature “ubuntu 14.04 (trusty)”: Ubuntu 14.04 (Trusty) container . This has has QT5 preinstalled. However we are getting sporadic failures on it on one project (am going to try out on another project). Have started a issue with capybara-webkit (https://github.com/thoughtbot/capybara-webkit/issues/890) to get insight and will investigate further, but would be useful to hear other peoples experiences here.
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