On Sun, Apr 25, 2010 at 10:27:52PM +0100, Jorge Almeida wrote:
> I need dev-texlive/texlive-pictures because it seems that's what
> provides xy-pic.  Why in Hell am I obliged to install ruby? I
> currently have no use for it. I can't begin to imagine why this
> particular programming language should  be a must... Nothing in the
> use flags suggests a clue, for me anyway...

Probably because it installs a heck lot more than just xypic? The full
list gives

  asyfig autoarea bardiag cachepic combinedgraphics circuitikz curve
curve2e curves dcpic diagmac2 doc-pictex dottex dot2texi dratex eepic 
epspdf epspdfconversion fig4latex gnuplottex here hvfloat miniplot 
pb-diagram petri-nets pgf-soroban pgfopts pgfplots picinpar pict2e 
pictex pictex2 pinlabel pmgraph randbild schemabloc swimgraf texdraw 
tikz-inet tikz-qtree tikz-timing tkz-doc tkz-linknodes tkz-tab 
tufte-latex xypic collection-pictures

Ruby is a RDEPEND; if you are interested you certainly can try
Googling to find out which in the above list is the offender. One
that I recognize which requires a ruby runtime is the converter epspdf.

Cheers, 

W
-- 
Willie W. Wong                                     ww...@math.princeton.edu
Data aequatione quotcunque fluentes quantitae involvente fluxiones invenire 
         et vice versa   ~~~  I. Newton

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