Sclang on a system without x?

Albert · December 21, 2022, 1:38am

Is it possible to run sclang without x? I am working on a Debian 11 system without x installed.

albert@t61:~$ sclang
compiling class library...
qt.qpa.screen: QXcbConnection: Could not connect to display
Could not connect to any X display.
terminate called without an active exception
Aborted

I have tried scvim and get a similar error regarding x.

Peter · December 21, 2022, 8:36am

Albert Elmore via scsynth noreply@m.scsynth.org [2022-12-21 02:45]:

Is it possible to run sclang without x? I am working on a Debian 11 system without x installed.
Have you tried to run it from within (neo)vim?

jordan · December 21, 2022, 9:28am

That looks like a Qt error. You might need to compile sc, disabling Qt, although, having never done it, I might be wrong.

mstep · December 21, 2022, 3:19pm

github.com/supercollider/supercollider

Enable running sclang without Qt.

opened 03:35PM - 09 Apr 21 UTC

closed 12:24AM - 11 Apr 21 UTC

zmrocze

enhancement comp: Qt GUI

## Motivation Using [tidalcycles](https://github.com/tidalcycles/Tidal) means r…unning [superdirt](https://github.com/musikinformatik/SuperDirt) from supercollider. I can execute the needed script with sclang and don't need scide. I am using windows subsystem for linux where Qt can't connect to display and sclang simply doesn't open - even though it doesn't open a gui app when it does open. Is it the case that sclang doesn't need Qt? ## Description of Proposed Feature As I understand - not requiring scide is not specific to tidal users. Creating an option to install supercollider without Qt dependency would alleviate troubles on wsl and in general would provide a more lightweight installation. ## Details on my case Running sclang or scide from the terminal on wsl2 yields an error: "qt.qpa.xcb: could not connect to display". This is because wsl2 as of now can't run gui apps. There are workarounds involving running Windows X server on Windows and connecting wsl with it via ssh, then wsl sends graphics for Windows to display it. I managed to do that and then correctly run sclang - showing that the installation is working and all Qt dependencies are satisfied. But running sclang doesn't pop up any window, the interface stays inside the terminal what makes me wonder why couldn't it open initialy. ### Previous issue Am I even correct assuming that Qt dependency can be eliminated for a subset of supercollider? [This issue](https://github.com/supercollider/supercollider/issues/4980#issue-625962641) suggests that it is. Maybe mine will provide more motivation for this change.

Albert · December 21, 2022, 4:09pm

Ok yes! Setting the environment variable below worked! Excellent. Thank you both!

export QT_QPA_PLATFORM=offscreen