@User: You have

-I /ef/tech/SW/sky130A

which is passed to iverilog and declares a search path where to find files in "include" statements that have relative paths. This

/ef/

path is specific to the efabless system, and is also wrong. If you are running this on efabless open galaxy, then the path should be

/ef/tech/SW.2/sky130A

. If you are running it locally, then it should point to the open_pdks installation, which is by default either

/usr/share/pdk/sky130A

or

/usr/local/share/pdk/sky130A

.