My Charisma is at 6 stars on the top line of the Perk Chart.

I put a point into Local Leader.

When I'm in Workshop mode and approach a civilian and right click the option to make a supply line is greyed out.

Supposedly you only need Charisma at 6 and one point in Local Leader to be able to make supply lines.

What is wrong?

I've approached a couple of different people with the same result.

This is in Sanctuary on a PC.

Only "settlers" can do supply lines. So if you are trying it on the named people who come from Concord, it isn't going to work.

They didn't really think that through by introducing you to settlement building by giving you a bunch of people who can't function like they are supposed to.

Thanks for the quick reply and info.

Don't think I've run into settlers yet. hmmmm.

Set up a radio tower to attract the basic 'settlers'.