verilog-library-directories

verilog-library-directories is a variable defined in `verilog-mode.el'.
Its value is

(".")

• This variable is safe as a file local variable if its value
  satisfies the predicate `listp'.

Documentation:
List of directories when looking for files for /*AUTOINST*/.
The directory may be relative to the current file, or absolute.
Environment variables are also expanded in the directory names.
Having at least the current directory is a good idea.

You might want these defined in each file; put at the *END* of your file
something like:

// Local Variables:
// verilog-library-directories:("." "subdir" "subdir2")
// End:

Verilog-mode attempts to detect changes to this local variable, but they
are only insured to be correct when the file is first visited. Thus if you
have problems, use C-x C-v RET to have these take effect.

See also `verilog-library-flags', `verilog-library-files'
and `verilog-library-extensions'.

You can customize this variable.