\chapter{Recently removed or moved libraries (Graphics, Bigarray, Num, LablTk)}
%HEVEA\cutname{old.html}

This chapter describes three libraries which were formerly part of the OCaml
distribution (Graphics, Num, and LablTk), and a library which has now become
part of OCaml's standard library, and is documented there (Bigarray).


\section{s:graphics-removed}{The Graphics Library}

Since OCaml 4.09, the "graphics" library is distributed as an external
package. Its new home is:

\url{https://github.com/ocaml/graphics}

If you are using the opam package manager, you should install the
corresponding "graphics" package:

\begin{alltt}
        opam install graphics
\end{alltt}

Before OCaml 4.09, this package simply ensures that the "graphics"
library was installed by the compiler, and starting from OCaml 4.09
this package effectively provides the "graphics" library.

\section{s:bigarray-moved}{The Bigarray Library}

As of OCaml 4.07, the "bigarray" library has been integrated into OCaml's
standard library.

The "bigarray" functionality may now be found in the standard library
\ifouthtml
  \ahref{libref/Bigarray.html}{\texttt{Bigarray} module},
\else
  \texttt{Bigarray} module,
\fi
except for the "map_file" function which is now
part of the \hyperref[c:unix]{Unix library}. The documentation has
been integrated into the documentation for the standard library.

The legacy "bigarray" library bundled with the compiler is a
compatibility library with exactly the same interface as before,
i.e. with "map_file" included.

We strongly recommend that you port your code to use the standard
library version instead, as the changes required are minimal.

If you choose to use the compatibility library, you must link your
programs as follows:
\begin{alltt}
        ocamlc \var{other options} bigarray.cma \var{other files}
        ocamlopt \var{other options} bigarray.cmxa \var{other files}
\end{alltt}
For interactive use of the "bigarray" compatibility library, do:
\begin{alltt}
        ocamlmktop -o mytop bigarray.cma
        ./mytop
\end{alltt}
or (if dynamic linking of C libraries is supported on your platform),
start "ocaml" and type "#load \"bigarray.cma\";;".

\section{s:graphics-removed}{The Num Library}

The "num" library implements integer arithmetic and rational
arithmetic in arbitrary precision. It was split off the core
OCaml distribution starting with the 4.06.0 release, and can now be found
at \url{https://github.com/ocaml/num}.

New applications that need arbitrary-precision arithmetic should use the
"Zarith" library (\url{https://github.com/ocaml/Zarith}) instead of the "Num"
library, and older applications that already use "Num" are encouraged to
switch to "Zarith". "Zarith" delivers much better performance than "Num"
and has a nicer API.

\section{s:labltk-removed}{The Labltk Library and OCamlBrowser}

Since OCaml version 4.02, the OCamlBrowser tool and the Labltk library
are distributed separately from the OCaml compiler. The project is now
hosted at \url{https://github.com/garrigue/labltk}.