make headers_install for out-of-tree modules

[Greg KH]

On Wed, Oct 07, 2015 at 10:51:25AM -0300, Daniel. wrote:
> Uhh, as I see from docs, this isn't supported,
> 
> --- 2.3 Targets
> 
> When building an external module, only a subset of the "make"
> targets are available.
> >From https://www.kernel.org/doc/Documentation/kbuild/modules.txt
> 
> So, how can I export ioctl calls defined by an out-of-tree module?

You get your out-of-tree module merged into the tree and it's
automatically solved for you :)