\documentclass[letterpaper]{book}

\usepackage{Rd}
\usepackage{makeidx}

\makeindex
\sloppy{}

\begin{document}\pagenumbering{roman}

\title{The \R\ Reference Index}

\date{\vspace*{15ex}\textsc{\small\input{Version}}}

\author{The \R\ Development Core Team}

\maketitle
\pagestyle{empty}
%%-- for ``2 pages on 1'' printing (make Manbooks):
\ \ \clearpage \ \ \clearpage

\pagestyle{headings}
\pagenumbering{roman}
\tableofcontents
\cleardoublepage

\pagenumbering{arabic}

\input{pkg-base}
\input{pkg-eda}
\input{pkg-lqs}
\input{pkg-modreg}
\input{pkg-mva}
\input{pkg-stepfun}

\cleardoublepage
\addcontentsline{toc}{chapter}{Index}
\printindex
\end{document}
