Bugzilla Bug 61938

docbook-sgml-utils include docbook2pdf, which itself needs jadetex to work
correctly.

Reproducible: Always
Steps to Reproduce:
1. Install docbook-sgml-utils and dependancies
2. Try to use docbook2pdf on a file.

Actual Results:  
docbook2pdf fails because it needs pdfjadetex, provided by jadetex.

Expected Results:  
Installation of docbook-sgml-utils should have installed jadetex as a
dependancy, to allow users to use docbook2pdf.

Version of docbook-sgml-utils used: 0.6.12

jadetex is a dependency with the use 'tetex' enabled. If you want to use
docbook2pdf you can emerge docbook-sgml-utils with this use flag enabled.

emerging jadetex had tetex as a dependancy without modifying other USE flags.

tetex USE flag is automatically enabled if you have app-text/tetex installed on
your system.
(unless you explicitly turned off by specifying USE="-tetex")

It isn't too much to install jadetex for those who have tetex, but I guess it
is too much to
install jadetex and tetex for those who only want to install
docbook-sgml-utils. Notably,
GNOME depends on scrollkeeper and scrollkeeper depends on docbook-sgml-utils,
which
means if you want to install GNOME you need to install tetex (if you make
docbook-sgml-utils
hard-depend on jadetex). This isn't welcomed for all GNOME users, IMO.

So I think the current DEPEND is correct (somewhat broken, though). What do you
say
about adding einfo to dokbook-sgml-utils to inform users to install jadetex if
they want
to use docbook2pdf?

I'd rather have docbook-sgml-utils not install docbook2pdf if tetex is not
USEd. At least it wouldn't produce a broken install. Same thing for other parts
of the package.

As for not pulling tetex as a dependancy to docbook-sgml-utils, when I emerged
kde, it pulled gtk+ as a dependancy with default USE flags, so pulling more
than less is already done with some packages.

Is there a way to force optional dependancies to be installed if they're not
already installed? Some sort of + USE flag (opposite of -)? That'd be useful
when you don't want to look at each ebuild to determine what should be pulled
manually before to get full functionnality (because it's not a hard
dependancy).

Such broken dependancies/installations is why I'd much rather install
everything at once (

I'd rather have docbook-sgml-utils not install docbook2pdf if tetex is not
USEd. At least it wouldn't produce a broken install. Same thing for other parts
of the package.

As for not pulling tetex as a dependancy to docbook-sgml-utils, when I emerged
kde, it pulled gtk+ as a dependancy with default USE flags, so pulling more
than less is already done with some packages.

Is there a way to force optional dependancies to be installed if they're not
already installed? Some sort of + USE flag (opposite of -)? That'd be useful
when you don't want to look at each ebuild to determine what should be pulled
manually before to get full functionnality (because it's not a hard
dependancy).

Such broken dependancies/installations is why I'd much rather install
everything at once (à la RedHat) rather than piecemeal everyday because
something is missing.

Fair enough, I'll remove docbook2pdf if USE="-tetex" from next release
of docbook-sgml-utils (I'll add it to CVS soon). Gtk was emerged on your
system because USE="gtk" is system profile, so if you don't want it you
need to set USE="-gtk" explicitly. That is different story from tetex. 

We had a thread about this behaviour at gentoo-dev list last week, 
so if you are interested in this topic, search the list and join the discussion.

Fixed in CVS. Thanks for the bug report.