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Has anyone experience with running ngspice on a mac (M1)? Everything works fine, except that I cannot get the plotting function to work (homebrew installation). Error message:
`Can't open viewport for graphics.`
I have XQuartz (2.8.2 ) installed and other plotting tools (e.g., gnuplot) work fine. Seems that ngspice cannot connect to XQuartz somehow. Any help is appreciated!

When building ngspice did you run configure with the `--with-x` option?

When executing `brew install ngspice --with-x` ,  I receive `Error: invalid option: --with-x`

no the option I mentioned is to be used if you compile ngspice from sources. I see you are installing a compiled package so forget the --with-x

also ensure you run ngspice in interactive mode if the plot is inside a .control / .endc section:

`ngspice -i circuit.spice`

Alternatively, you can run `ngspice` in our Docker natively on Mac M1 (in addition to many more tools, of course): <https://github.com/iic-jku/IIC-OSIC-TOOLS>

Homebrew does compile ngspice with configure flag --without-x, so without graphics interface to X11.