multiple sources folder view UnionFS

[Dj YB]

On Monday May 10 2010 00:06:10 Oron Peled wrote:
> On Sunday, 9 בMay 2010 21:48:20 Dj YB wrote:
> > is it possible to configure a folder in Dolphin or any other way to show
> > the content of multiple sources?
> > 
> > for example the folder ~/Movies will show the content of the folders
> > /mnt/Disk-500/Movies
> > /mnt/Disk-250/Movies
> > ~/Downloads/videos
> 
> You just described the UnionFS concept ;-)
>   http://www.filesystems.org/project-unionfs.html
> 
> While it's actively developed (upto 2.6.34), it's not in (official)
> upstream kernel and as a result, not included in fedora.
> [it's used by Knoppix for a log time]
> 
> Alternatively, there's a fuse (Filesystem-in-USErspace) implementation:
>   http://podgorny.cz/moin/UnionFsFuse
> 
> It isn't packaged for fedora, but maybe someone (you?) may want to do it.
> I found old packages on Dag Wieers and Dries repositories which may
> help you as a starting point:
>   http://dag.wieers.com/rpm/packages/fuse-unionfs/
>   http://dries.studentenweb.org/rpm/packages/fuse-unionfs/info.html
> 
> > I saw it in Win7 and thought it could be very useful.
> 
> Unionfs-1.x is from 2004-2006. Maybe they borrowed it ;-)

thanks, that is really what I meant.
this is strange, I can see there lots of distros that are using this like 
OpenSUSE and Ubuntu but not Fedora/CentOS/RedHat... why?
it seems like something very basic.

how do I build this?
regards,
YB.