Unable to compile supercollider without QT/gui on raspbian lite

I am trying to compile supercollider without gui and without QT,
following the instructions at:

I am running raspbian 10 (buster).
I followed all the instructions marked for without GUI and without QT.
I get error:
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146
Could NOT find X11 (missing: X11_X11_INCLUDE_PATH X11_X11_LIB)

Any hints as to what I may have overseen?

Thank you,

Iannis Zannos

hi Iannis,
(sorry, posted this some time ago but email didn’t get through)

hm, instructions work fine here with 2021-05-07-raspios-buster-armhf-lite.zip on a RPi3. i could compile SC and didn’t get your missing X11 error.
perhaps try again and take extra care only running the “For a GUI-less build” sections. (i know the gui vs non-gui parts are a bit mixed up - could be improved).

also, sidenote, if you’re planning to use the built-in or HDMI audio outputs, i’d recommend to for now use an older disk image (before dec2020) because something got messed up when Raspberry Pi OS switched to PulseAudio. see https://github.com/supercollider/supercollider/issues/5480
so for example a 2020-08-20-raspios-buster-armhf-lite image will work well. with newer images you’ll run into issues with jack vs pulse.
though for usb soundcards this isn’t an issue. then the latest 2021-05-07 image is ok.

Thank Frederik.
My mistake: I had miscopied the command for GUI instead of the one without GUI.
Now it works.!