[gentoo-user] Re: make an -9999 ebuild compile only if necessary

[Nikos Chantziaras]

On 12/22/2009 07:21 PM, Helmut Jarausch wrote:
> Hi,
>
> I have ebuilds fetching the source code directly from a repository
> (be it CVS,SVN,HG,GIT,...)
> I'd like to modify the .ebuild to enter compilation only if something
> has been updated.
> Is this possible, has somebody else tried to do so?

Given that portage relies on USE flags and version numbers to decide on 
whether a rebuild is necessary, no, it's not possible.

But I'd be interested too if someone could think of some clever hack to 
accomplish this :)