@User to do analog simulations with skywater pdk and xschem/ngspice you need to: • Clone the ngspice git repository and build ngspice as explained in the INSTALL file therein. • Clone the xschem git repository and build xschem as explained here. • Install magic layout program, the procedure is similar to above. • Install open_pdks • see the ngspice manual • see the xschem online docs

The ngspice git repository does not exist, will the package version work.

@Mudasir git clone git://git.code.sf.net/p/ngspice/ngspice