Is there any documentation on how to set up xschem for sky130 or gf180? I see the files in the pdk, just not sure if I'm supposed to copy the xschemrc or set PDK_ROOT or you know... how to properly launch xschem with the correct paths and libraries loaded.

@Pepijn de Vos I found it easiest if I copy

xschemrc

to the working directory. Then edit it to use the library paths that I want. Sometimes the pdk is accessed through a PDKPATH variable which needs to be set in the shell.

export PDKPATH=$PDK_ROOT/$PDK

I'm getting

can't read "USER_CONF_DIR": no such variable