How to create `/run` folder and possibly subfolders?

For the past few years, running xdf yields the warning $QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-fma' QXcbShmImage: shmget() failed (88: Function not implemented) for size 3208656 (1133x708) According to [this page](https://github.com/swaywm/sway/issues/7202#issuecomment-1741707958) . I need the following in my ~/.bashrc: export XDG_RUNTIME_DIR=/run/user/$(id -u) I using Cygwin, and I don't have a folder /run. I want to create it, but I'm not sure how best to do so in a way that all accounts can use it. I have an admin account and various other accounts for different purposes, e.g.,. personal, work-related, gaming, etc. How should I create /run? Should I also create /run/user for different accounts?