bug#56144: perl-mail-spf package installs, but does not run.

[Tobias Geerinckx-Rice]

Hi Eduard!

Eduard Budulea via Bug reports for GNU Guix 写道：
> I have tried to move the dependencies from input to 
> input-propagated,
> but got the same result.

Even if that did work, installing perl-mail-spf would then also 
install these other perl-* packages — no better than a traditional 
distro.  Avoid propagation wherever possible.

Instead, you should ‘wrap’ the spfquery executable so that 
PERL5LIB is correctly set when it's invoked, without polluting the 
user's profile.

Look at the ‘dirvish’ package for an arbitrary but seemingly sane 
example.

Kind regards,

T G-R

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