@User if open_pdks is installed into a place xschem can not find (not in your home directory,. not in /usr/local) you must set a PDK_ROOT variable:

export PDK_ROOT=.....

before launching xschem. If you look the bottom of your xschemrc you see:

set SKYWATER_MODELS ${PDK_ROOT}/${PDK}/libs.tech/ngspice

PDK_ROOT is the root directory of the open_pdks installation,

PDK

usually is just

sky130A

. Whatever value you set for

PDK_ROOT

the path

${PDK_ROOT}/sky130A/libs.tech/ngspice

must exist on your system, to test just do:

ls ${PDK_ROOT}/sky130A/libs.tech/ngspice

If the directory is not found don't even try to start xschem, it will not find the open_pdks installation.

Okay I will do this as well! Thanks Stefan