@Stefan Schippers how to rectify this error , xschem Warning: PDK_ROOT env. var. not found or empty, trying to find an open_pdks install No open_pdks installation found, set PDK_ROOT env. var. and restart xschem Tcl_AppInit() error: can not execute /home/bn/.xschem/xschem_sky130/xschemrc, please fix: can't read "PDK_ROOT": no such variable