XDG_RUNTIME_DIR not set in the environment

[cki61]

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how can I set the XDG_RUNTIME_DIR (using leap 15.2beta)?

ERROR is:

cki@localhost:~/Quellcode_privat/Qt/multibootusb-9.2.0> sudo python3 ./multibootusb [sudo] Passwort für root: Using python version 3.6.10 (default, Jan 16 2020, 09:12:04) [GCC] on platform Linux-5.6.6-1.gc11f000-default-x86_64-with-glibc2.3.4 Running multibootusb version 9.2.0 from source... Starting multibootusb GUI... qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. error: XDG_RUNTIME_DIR not set in the environment. Failed to create wl_display (No such file or directory) qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found. This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

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