%* glpk07.tex *%

\chapter{Installing GLPK on Your Computer}

\label{install}

\section{Downloading the distribution tarball}

The distribution tarball of the most recent version of the GLPK

package can be found on \url{http://ftp.gnu.org/gnu/glpk/} [via http]

and \url{ftp://ftp.gnu.org/gnu/glpk/} [via FTP]. It can also be found

on one of the FTP mirrors; see \url{http://www.gnu.org/prep/ftp.html}.

Please use a mirror if possible.

To make sure that the GLPK distribution tarball you have downloaded is

intact you need to download the corresponding `\verb|.sig|' file and

run a command like this:

\begin{verbatim}

   gpg --verify glpk-4.38.tar.gz.sig

\end{verbatim}

\noindent

If that command fails because you do not have the required public key,

run the following command to import it:

\begin{verbatim}

   gpg --keyserver keys.gnupg.net --recv-keys 5981E818

\end{verbatim}

\noindent

and then re-run the previous command.

\section{Unpacking the distribution tarball}

The GLPK package (like all other GNU software) is distributed in the

form of packed archive. This is one file named \verb|glpk-X.Y.tar.gz|,

where {\it X} is the major version number and {\it Y} is the minor

version number.

In order to prepare the distribution for installation you should:

\medskip

1. Copy the GLPK distribution file to a working subdirectory.

\medskip

2. Unpack the distribution file with the following command:

\begin{verbatim}

   gzip -d glpk-X.Y.tar.gz

\end{verbatim}

\noindent

that renames the distribution file to \verb|glpk-X.Y.tar|.

\medskip

3. Unarchive the distribution file with the following command:

\begin{verbatim}

   tar -x < glpk-X.Y.tar

\end{verbatim}

\noindent

that automatically creates the subdirectory \verb|glpk-X.Y| containing

the GLPK distribution.

\section{Configuring the package}

After unpacking and unarchiving the GLPK distribution you should

configure the package, i.e. automatically tune it for your platform.

Normally, you should just \verb|cd| to the subdirectory

\verb|glpk-X.Y| and run the configure script, e.g.

\begin{verbatim}

   ./configure

\end{verbatim}

The `\verb|configure|' shell script attempts to guess correct values

for various system-dependent variables used during compilation. It uses

those values to create a `\verb|Makefile|' in each directory of the

package. It also creates file `\verb|config.h|' containing

platform-dependent definitions. Finally, it creates a shell script

`\verb|config.status|' that you can run in the future to recreate the

current configuration, a file `\verb|config.cache|' that saves the

results of its tests to speed up reconfiguring, and a file

`\verb|config.log|' containing compiler output (useful mainly for

debugging `\verb|configure|').

Running `\verb|configure|' takes about a few minutes. While it is

running, it displays some informational messages that tell you what it

is doing. If you don't want to see these messages, run

`\verb|configure|' with its standard output redirected to

`\verb|dev/null|'; for example, `\verb|./configure > /dev/null|'.

By default both static and shared versions of the GLPK library will be

compiled. Compilation of the shared librariy can be turned off by

specifying the `\verb|--disable-shared|' option to `\verb|configure|',

e.g.

\begin{verbatim}

   ./configure --disable-shared

\end{verbatim}

\noindent

If you encounter problems building the library try using the above

option, because some platforms do not support shared libraries.

\newpage

The GLPK package has some optional features listed below. By default

all these features are disabled. To enable a feature the corresponding

option should be passed to the configure script.

\bigskip

\noindent

\verb|--with-gmp         | Enable using the GNU MP bignum library

\medskip

This feature allows the exact simplex solver to use the GNU MP bignum

library. If it is disabled, the exact simplex solver uses the GLPK

bignum module, which provides the same functionality as GNU MP, however,

it is much less efficient.

For details about the GNU MP bignum library see its web page at

\url{http://gmplib.org/}.

\bigskip

\noindent

\verb|--with-zlib        |

Enable using the zlib data compression library

\medskip

This feature allows GLPK API routines and the stand-alone solver to

read and write compressed data files performing compression and

decompression ``on the fly'' (compressed data files are recognized by

suffix `\verb|.gz|' in the file name). It may be useful in case of

large MPS files to save the disk space.

For details about the zlib compression library see its web page at

\url{http://www.zlib.net/}.

\bigskip

\noindent

\verb|--enable-dl        | The same as `\verb|--enable-dl=ltdl|'

\noindent

\verb|--enable-dl=ltdl   | Enable shared library support (GNU)

\noindent

\verb|--enable-dl=dlfcn  | Enable shared library support (POSIX)

\medskip

Currently this feature is only needed to provide dynamic linking to

ODBC and MySQL shared libraries (see below).

For details about the GNU shared library support see the manual at

\url{http://www.gnu.org/software/libtool/manual/}.

\bigskip

\noindent

\verb|--enable-odbc      |

Enable using ODBC table driver (\verb|libiodbc|)

\noindent

\verb|--enable-odbc=unix |

Enable using ODBC table driver (\verb|libodbc|)

\medskip

This feature allows transmitting data between MathProg model objects

and relational databases accessed through ODBC.

For more details about this feature see the supplement ``Using Data

Tables in the GNU MathProg Modeling Language'' (\verb|doc/tables.pdf|).

\bigskip

\noindent

\verb|--enable-mysql     |

Enable using MySQL table driver (\verb|libmysql|)

\medskip

This feature allows transmitting data between MathProg model objects

and MySQL relational databases.

For more details about this feature see the supplement ``Using Data

Tables in the GNU MathProg Modeling Language'' (\verb|doc/tables.pdf|).

\section{Compiling the package}

Normally, you can compile (build) the package by typing the command:

\begin{verbatim}

   make

\end{verbatim}

\noindent

It reads `\verb|Makefile|' generated by `\verb|configure|' and performs

all necessary jobs.

If you want, you can override the `\verb|make|' variables \verb|CFLAGS|

and \verb|LDFLAGS| like this:

\begin{verbatim}

   make CFLAGS=-O2 LDFLAGS=-s

\end{verbatim}

To compile the package in a different directory from the one containing

the source code, you must use a version of `\verb|make|' that supports

`\verb|VPATH|' variable, such as GNU `\verb|make|'. `\verb|cd|' to the

directory where you want the object files and executables to go and run

the `\verb|configure|' script. `\verb|configure|' automatically checks

for the source code in the directory that `\verb|configure|' is in and

in `\verb|..|'. If for some reason `\verb|configure|' is not in the

source code directory that you are configuring, then it will report that

it can't find the source code. In that case, run `\verb|configure|' with

the option `\verb|--srcdir=DIR|', where \verb|DIR| is the directory that

contains the source code.

Some systems require unusual options for compilation or linking that

the `\verb|configure|' script does not know about. You can give

`\verb|configure|' initial values for variables by setting them in the

environment. Using a Bourne-compatible shell, you can do that on the

command line like this:

\begin{verbatim}

   CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure

\end{verbatim}

\noindent

Or on systems that have the `\verb|env|' program, you can do it like

this:

\begin{verbatim}

   env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure

\end{verbatim}

Here are the `\verb|make|' variables that you might want to override

with environment variables when running `\verb|configure|'.

For these variables, any value given in the environment overrides the

value that `\verb|configure|' would choose:

\medskip

\noindent

\verb|CC      | C compiler program. The default is `\verb|cc|'.

\medskip

\noindent

\verb|INSTALL | Program used to install files. The default value is

`\verb|install|' if

\noindent

\verb|        | you have it, otherwise `\verb|cp|'.

\medskip

For these variables, any value given in the environment is added to the

value that `\verb|configure|' chooses:

\medskip

\noindent

\verb|DEFS    | Configuration options, in the form

`\verb|-Dfoo -Dbar| \dots'.

\medskip

\noindent

\verb|LIBS    | Libraries to link with, in the form

`\verb|-lfoo -lbar| \dots'.

\section{Checking the package}

To check the package, i.e. to run some tests included in the package,

you can use the following command:

\begin{verbatim}

   make check

\end{verbatim}

\section{Installing the package}

Normally, to install the GLPK package you should type the following

command:

\begin{verbatim}

   make install

\end{verbatim}

\noindent

By default, `\verb|make install|' will install the package's files in

`\verb|usr/local/bin|', `\verb|usr/local/lib|', etc. You can specify an

installation prefix other than `\verb|/usr/local|' by giving

`\verb|configure|' the option `\verb|--prefix=PATH|'. Alternately, you

can do so by consistently giving a value for the `\verb|prefix|'

variable when you run `\verb|make|', e.g.

\begin{verbatim}

   make prefix=/usr/gnu

   make prefix=/usr/gnu install

\end{verbatim}

After installing you can remove the program binaries and object files

from the source directory by typing `\verb|make clean|'. To remove all

files that `\verb|configure|' created (`\verb|Makefile|',

`\verb|config.status|', etc.), just type `\verb|make distclean|'.

The file `\verb|configure.ac|' is used to create `\verb|configure|' by

a program called `\verb|autoconf|'. You only need it if you want to

remake `\verb|configure|' using a newer version of `\verb|autoconf|'.

\section{Uninstalling the package}

To uninstall the GLPK package, i.e. to remove all the package's files

from the system places, you can use the following command:

\begin{verbatim}

   make uninstall

\end{verbatim}

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