Can I adapt old lenses to leica m?

Here is what the site says about that.

From Leica M: Leica M: Leica's rangefinder mount: manual focus, small lenses, and a history going back to 1954. M lenses adapt to almost every mirrorless body, as manual-focus lenses.

From Leica M EV1: Adapting lenses: M lenses adapt to almost every mirrorless body, as manual-focus lenses.

Quoted from this site's pages.