I managed to do this by setting a global tcl

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< U017H530WC9> I managed to do this by setting a global tcl var in my xschemrc ```set SKYWATER MODELS ~ projects foundry skywater pdk libraries sky130 fd pr ngspice latest``` then you can reference this var in your code element as in this example ``` include $ SKYWATER MODELS cells nfet 01v8 sky130 fd pr nfet 01v8 tt corner spice``` some considerations the $ character is escaped since it is also used within xschem for circuit variable expansion the means global scope in tcl the slash after MODELS is also escaped since in xschem slash is not a separator as in many types of netlists slashes are used as net name identifiers Don t blame me for that to edit press q and select the value attribute in Edit attrs or better press Shift q this brings up your favorite editor to edit the value attribute After doing the netlist the path is expanded ``` include ~ projects foundry skywater pdk libraries sky130 fd pr ngspice latest cells nfet 01v8 sky130 fd pr nfet 01v8 tt corner spice``` I decided to include this variable expansion in xschem since ngspice does not use any environmental variables in include lib lines and there is no plan to do that afaik Examples in the repo use this variable expansion