@User: You should not need to use

.param mc_mm_switch

, as that is defined within the

tt

definition. You should see this at the top of

sky130.lib.spice

(otherwise your installation of open_pdks is seriously outdated, like a year old or something).

* Typical corner (tt)
.lib tt
.param mc_mm_switch=0
.param mc_pr_switch=0
* MOSFET
.include "corners/tt.spice"
* Resistor/Capacitor
.include "r+c/res_typical__cap_typical.spice"
.include "r+c/res_typical__cap_typical__lin.spice"
* Special cells
.include "corners/tt/specialized_cells.spice"
.endl tt