Originally posted by Bobucles:

Boars have a natural desire to return to their spawn point. Aggro them as far as you can, trap them in a pen, throw some food inside, and run off.

AFAIK this only applies to special spawns, such as near rune stones telling about boars and village-boars (these are the only two IIRC). Randomly spawned boars will not want to wander back, but the ones who do, will try to do that even after taming.

But the special spawns can span starred boars despite being close to the original spawn point (with the boss stones). Typically, you want to tame the special spawned starred boars on their spot and only move their offspring (as they do not want to wander back anymore) ... which can be really time-consuming (but possible).

I'd just build a base far away, and forget these special spawns, they are not worth it IMHO (unless find a good spot to build a base next to a spacial spawn). Just wait for a regular one.