The documentation for the lib pragma says this:

use lib LIST;

and this:

The parameters to use lib are added to the start of the perl search path.

(Note the plural "parameters")

From that we can assume that we can pass a list of directories to use lib and it will do what we expect.

use lib qw(/path/to/one/library /path/to/another);
[download]

Of course, multiple calls to use lib work too.

use lib '/path/to/one/library';
use lib '/path/to/another';
[download]

It's always well worth checking the documentation for answers to questions like this.