mxcl/homebrew — pull request #11486 by sparks (2012-04-06 18:45:57+00:00)
Title: Update ngspice formula with xspice support

xspice provides compatibility with keyfeatures from spice2 which are
absent from spice3. This means many models available on the internet or
from manufactures which were written in spice2 will be compatible with
ngspice.

Also added a flag to disbale xspice support in case it isn't wanted.