Re: [gentoo-user] emerge --depclean and fftw

[Dale <dalek@exceedtech.net>]

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Bo Ørsted Andresen wrote:
>
> I somehow get the feeling you haven't quite understood what I have said. So 
> I'll try again. media-libs/libsamplerate only depends on sci-libs/fftw if you 
> have the fftw use flag enabled.
>
> # emerge -vp1 libsamplerate
> [...]
> [ebuild   R   ] media-libs/libsamplerate-0.1.2  USE="-fftw -sndfile" 0 kB
>
> I.e. if you have no "-" in front of fftw then it needs fftw. Further what I 
> have said is that `equery depends` ignores that condition. So you have three 
> other alternatives for `equery depends` which will be able to show reverse 
> dependencies. I've already mentioned two. The third is adjutrix from 
> sys-apps/paludis (version 0.8.2 would be necessary there). pquery or dep does 
> seem more suited for this task though since they both take your use flags 
> into consideration whereas adjutrix will show something like:
>
> # adjutrix -D /var/db/pkg -r fftw
> Reverse dependencies for 'sci-libs/fftw':
>   media-libs/libsamplerate-0.1.2 DEPEND on one of:
>     sci-libs/fftw-3.0.1-r2::installed (condition USE='fftw')
> [...]
>
> and leave it up to you to check whether the USE='fftw' condition is true.
>
> Finally I would like to say that whether you want to use testing software is 
> your own decision. But it certainly does do a better job than equery for 
> reverse dependencies. That's true no matter which of the three mentioned 
> alternatives you would choose. And I wouldn't suggest them if I thought they 
> would set you computer on fire...
>
>   
Ahhh, I see now what you are saying.  Default is to use fftw unless I
turn it off.  Gotcha now.  I did see what you were saying about equery
depends though.  It sort of makes assumptions on USE whether they are
true or not.  I am disabled and I hurt a lot so sometimes it takes me a
while to get my light bulb to turn on.  ;-)

I do use some testing stuff, like KDE and some other things that won't
make me bork up to much.  I do try to be very careful though when it
comes to things like python, gcc and those critical things.  I messed up
my system once and had to install from scratch and I learned to be
careful.  Gentoo is a bit harder to install and takes longer too than
say Mandriva.  I knew they wouldn't set my system on fire but I always
ask first before I do anything I may regret.  I'm also on dial-up so I
prefer not to have to download ALL the source stuff again either.

I see what you are saying and have learned a lot.  Thanks for the help.

Dale

:-)  :-)

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