\documentclass[a4paper,10pt]{article}

\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx} %for inserting figures
\usepackage[authoryear,longnamesfirst,round,comma]{natbib}
\usepackage{longtable}
\usepackage{colortbl}
\usepackage{setspace}
\usepackage{listings}
\usepackage{color}
\usepackage{hyperref}
 \hypersetup{backref,colorlinks=true}
\usepackage{ae,aecompl}

%%%%%%%%%%%%%%%%%%%
% Page Layout
%%%%%%%%%%%%%%%%%%%

\headheight      0.7cm
\headsep         1.0cm
\topskip         0.0cm


%%%%%%%%%%%%
% Set up the margins
%%%%%%%%%%%%
\oddsidemargin  0cm
\leftmargin     -2.0cm
\rightmargin    0.6cm
\topmargin      -2cm
\textheight     24.0cm %bottom margin is relative to top!
\textwidth      6.5in
\fontsize       {12}{14} % I think this is superceded by the 12pt in the documentclass
%\parskip        5.mm


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Try to disable hyphenation
\pretolerance=2000
\tolerance=3000


%try to use semicolons between in text citations instead of commas
\bibpunct{(}{)}{;}{(a}{}{}
    %%%%%%%%%%%% set the harvard style used in text
    %\citationmode{default}

    %%%%%%%%%%%%%%%%%%%%%%%%%
    %Preventing figures from appearing on a page by themselves.

    % LaTeX's figure placement algorithm is quite biased in favour of putting figures on a page by themselves, instead of on the top of a page with some text below it.  Often, I find the result aesthetically unappealing (to be polite).  Fortunately, the parameters of the algorithm can be changed.  The main problem is that LaTeX per default only allows a part of the top of a text-page (70%) to contain figures, and requires at least 20% of a page to be text when text and figures share a page.  These parameters should be set to more reasonable values, for example 85% and 10%.
    \renewcommand{\topfraction}{0.85}
    \renewcommand{\textfraction}{0.1}

    %  This helps, but sometimes LaTeX puts a figure on a page by itself, although it would fit perfectly well on the top of a page.  This happens when the figure will not fit on the page where it was defined.  LaTeX then attempts to put it on a figures-only page before it attempts to put it at the top of the next page.  A page may contain figures alone if the figure(s) use at least half the page.  To prevent half-empty pages this limit should probably be increased to around 75%.
    \renewcommand{\floatpagefraction}{0.75}

    %    Be careful not to make \floatpagefraction larger than \topfraction, then you risk to produce a figure that can neither go on the top of a text page, nor on a page by itself.  If that happens, the figure and all later figures will be postponed until next time a \clearpage is executed (typically at the end of a chapter or the end of the document).  This will also happen if a figure is too large to fit on a page.
    %%%%%%%%%%%%%%%%%%%%%%%%%%


    % Title Page
    \title{Building and Installing QGIS}
    \author{Gary Sherman \and Tim Sutton}


%\date{May 2004}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Set up page headers
\usepackage{fancyhdr}
% \fancyhead[L,R]{\slshape \rightmark}
 \fancyhead[L]{\slshape Building QGIS 0.5}
% 
% \fancyfoot[L,L]{\slshape}
% \fancyfoot[C]{\page}
% \fancyfoot[R,R]{\slshape}
\pagestyle{fancy}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Define our own custom colors
\definecolor{gray}{rgb}{.5,.5,.5} %rgb values expressed as 0-1 not 0-255!
\definecolor{lightgray}{rgb}{.9,.9,.9} %rgb values expressed as 0-1 not 0-255!
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%     START OF DOCUMENT %%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\begin{document}

% To disable first line indents of paragraphs after the first one
\setlength{\parindent}{0in}

\maketitle
\tableofcontents
%added by Tim to create a decent space between paragraphs
%note its only after toc so toc remains compact
\setlength{\parskip}{8pt plus 1pt minus 1pt}
% Spacing options are:
% \singlespacing, \onehalfspacing, or \doublespacing
%\onehalfspacing

% \lstset{language=csh}
% \lstset{commentstyle=\textit}
%\lstset{frameround=fttt}
% \lstset{framesep=3mm}
% \lstset{backgroundcolor=\color[rgb]{.95,.95,.95}}
%\lstset{frame=shadowbox}

\pagenumbering{arabic}
\input{install_source.tex}
\end{document}