@User I have installed MADVLSI on my system in my home directory ,

~/madvlsi_git

. Then in

madvlsi_git/inverter_tutorial

i have copied xschemrc from my open_pdks install:

~/share/pdk/sky130A/libs.tech/xschem/xschemrc

, and added this line at the end:

append XSCHEM_LIBRARY_PATH :/home/schippes/madvlsi_git/madvlsi

then i have loaded the example:

xschem buffer_tran.sch

since instances use absolute paths i have changed to relative paths:

./buffer.sym

instead of:

/home/madvlsi/MADVLSI/inverter_tutorial/buffer.sym

and did the same for all other instances that were unresolved.