lib/texinputs/pdfsetup.sty

tuned;

%%
%% $Id$
%% Author: Markus Wenzel, TU Muenchen
%% License: GPL (GNU GENERAL PUBLIC LICENSE)
%%
%% conditional url/hyperref setup
%%

\@ifundefined{pdfoutput}{\usepackage{url}}
{\usepackage[pdftex,a4paper,colorlinks=true]{hyperref}
  \IfFileExists{thumbpdf.sty}{\usepackage{thumbpdf}}{}}