PKG_SOURCE_URL and file:// location for directories

Hello. I have local modifications for some package and want check changes on the fly. Originally, package was includded via 'git':


PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL=git...

but i want to have smth like

 
PKG_SOURCE_URL=file:///abs/path/to/my/package

i oobtasined error since, as i understand, unpacking should be done. But in my case everything has been already unpacked.
Therefore, i don't need solutions like there:

Not ideal, but anyway better than nothing:

let proto remains git and


PKG_SOURCE_URL=/path/to/my/local/repo/.git

Yes, still i need to commit and patch commit id in the appropriate makefile, but it is much better...