[Development] Installing Qt5 on RHEL 6

[from at alumni.stanford.edu]

Dear Qt Developers,

We need to install Qt5 on RHEL 6 on a Cray supercomputer. We need it to run
apps on the computer and view results using X11 forwarding.

Our first attempt has not been successful. We we try to copy, we're getting
the error message:

QXcbClipboard::setMimeData: Cannot set X11 selection owner

and the copy doesn’t happen.

When we exit an app using Qt5 we get the additional error message:

QApplication::qAppName: Please instantiate the QApplication object first

Your advice would be much appreciated,

Bill
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