If the variable (17.7) ngbehavior is set to 'ltps' or 'ltpsa' with the commands

set ngbehavior=ltps

or

set ngbehavior=ltpsa

in spinit or .spiceinit, ngspice will translate all files that have been read into ngspice netlist by the .include command (ltps) or the complete netlist (ltpsa) 16.13.6, 16.13.5 from LTSPICE and PSPICE syntax to ngspice. This feature allows reading of LTSPICE and PSPICE compatible device libraries or complete netlists.