@User looks like you may want it yes. To apply @User's patch do: cd into skywater-pdk/libraries/ copy the patch from xschem_sky130/sky130_fd_pr.patch into the current folder copy sky130_fd_pr/latest/ to sky130_fd_pr_ngspice/latest/ e.g. mkdir sky130_fd_pr_ngspice;cp -r sky130_fd_pr/latest/ sky130_fd_pr_ngspice/ patch -s -p0 < sky130_fd_pr.patch Name swap “sky130_fd_pr_ngspice” and “sky130_fd_pr” There's probably a way of using "patch" which doesn't require you to switch the folder names but I didn't bother looking into it since I just wanted to get it up and running.

@Tom @Stefan Schippers so copy the fd_pr lib into fd_pr_ngspice ( so now we have two folders but with diff names) . Then apply the patch command as you shown. the swap the name of the folders. Correct ?

yes that's correct

Let me try !

You should be able to almost paste my description into the terminal. Did it work?

The library names are different for me, so had to change. Now after running the patch command, it is asking "File to patch" @Tom