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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Free AMD Core Math Library (BLAS/LAPACK) + Ada
Date: Sun, 15 Jul 2012 21:41:56 +0100
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Date: 2012-07-15T21:41:56+01:00
List-Id: <comp.lang.ada>

Ludovic Brenta <ludovic@ludovic-brenta.org> writes:

> Simon Wright writes on comp.lang.ada:
>> Thanks for that. We really needed advice from someone who knows.
>>
>> By way of experiment, I removed liblapack-dev which left
>> /usr/lib/liblapack.{a,so} pointing to the now deleted /etc/alternatives/
>> files. So I suppose the /usr/lib files get created when
>> update-alternatives is run after a new install of libfoo-dev?
>
> Correct but only if libfoo-dev participates in the alternatives system.

>                                           If the two packages are done
> correctly:
>
> - installing the first -dev package will initialize the alternatives
>   system and create /usr/lib/liblapack.so to point to
>   /usr/lib/$package/liblapack.so.
>
> - installing the second -dev package should ask you whether or not to
>   change the default to be the new liblapack.so or tell you that it
>   updated the alternative without asking (in the output of dpkg).
>
> - uninstalling one of the -dev packages should automatically change the
>   alternative to point to the remaining liblapack.so; therefore you
>   should never be left with a dangling symlink.
>
> If any of these things fail to happen (and you are sure you did not
> tamper with symlinks by hand), please file a bug against the -dev
> package that you installed or removed last.

I think what I did was to uninstall the last -dev package.