package-directory-list

package-directory-list is a variable defined in `package.el'.
Its value is

("/usr/local/share/emacs/25.0.50/site-lisp/elpa" "/usr/local/share/emacs/site-lisp/elpa")

• This variable may be risky if used as a file-local variable.

Documentation:
List of additional directories containing Emacs Lisp packages.
Each directory name should be absolute.

These directories contain packages intended for system-wide; in
contrast, `package-user-dir' contains packages for personal use.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.