Subject: [bug#27344] [PATCH 11/12] gnu: Add qucs.

From: Danny Milosavljevic <[email-masked]>
Date: Thu, 15 Jun 2017 13:37:46 +0200

> +             ;; The test suite requires a running X server.
> +             (system "Xvfb :1 &")
> +             (setenv "DISPLAY" ":1")
> +             #t))

Does it?  (setenv "QT_QPA_PLATFORM" "offscreen") is not enough?