INSTALL

Installation {#installation}
============================

[TOC]

This file describes the installation process for Amino.

Setup and Dependencies {#installation_setup}
======================

The following dependies are required or optional.  Please see below
for the corresponding list of Debian and Ubuntu packages.  Also,
please consult the errata notes below as some package versions have
missing features or bugs that require workarounds.

Required Dependencies {#installation_setup_required}
---------------------

These dependecies are required to compile and use Amino:

* GCC or Clang
* [BLAS] (http://www.netlib.org/blas/) and [LAPACK]
  (http://www.netlib.org/lapack/) (Optimized implementions such as
  [OpenBLAS](http://www.openblas.net/), [Intel MKL]
  (https://software.intel.com/en-us/intel-mkl), or [ATLAS]
  (http://math-atlas.sourceforge.net/) are recommended.)
* [NLopt] (http://github.com/stevengj/nlopt)
* [GFortran] (https://gcc.gnu.org/fortran/) or [F2C] (http://www.netlib.org/f2c/) (only to build from git)
* [Maxima] (http://maxima.sourceforge.net/) (only to build from git)
* [Flex] (http://flex.sourceforge.net/) (only to build from git)

Optional Dependencies {#installation_setup_optional}
---------------------

These dependecies are optional and may be used to enable additional
features in Amino:

* Robot Models (URDF, COLLADA, Wavefront, etc.):
  - [Flex, The Fast Lexical Analyzer] (http://flex.sourceforge.net/)
    (needed to parse Wavefront OBJ files)
  - [Blender] (http://www.blender.org) (used to convert mesh files, see
    'Note 1' on versions below)
  - [SBCL] (http://www.sbcl.org/) (see 'Note 2' on versions below)
  - [Quicklisp] (https://www.quicklisp.org)
  - [Sycamore] (https://github.com/ndantam/sycamore)
* GUI / Visualization:
  - [OpenGL] (https://www.opengl.org/)
  - [SDL2] (https://www.libsdl.org/)
  - plus everything under Robot Models, if you want to visualize
    meshes, URDF, etc.
* Raytracing (everything under Robot Models, plus):
  - [POV-ray] (http://www.povray.org/)
  - [ffmpeg] (https://www.ffmpeg.org/)
* Motion Planning:
  - [FCL] (https://github.com/flexible-collision-library/fcl)
  - [OMPL] (http://ompl.kavrakilab.org/)
  - plus everything under Robot Models, if you want to handle
    meshes, URDF, etc.
* Java Bindings
  - Java SDK
* Optimization, any or all of the following:
  - [CLP] (http://www.coin-or.org/projects/Clp.xml)
  - [GLPK] (https://www.gnu.org/software/glpk/)
  - [LP-Solve] (http://lpsolve.sourceforge.net/5.5/)

Debian and Ubuntu GNU/Linux {#installation_setup_apt}
---------------------------

Most the dependencies on Debian or Ubuntu GNU/Linux can be installed
via APT.  The following command should install all/most dependencies.
For distribution-specific package lists, please see the files under
`./share/docker/` which are used for distribution-specific integration
tests.

    sudo apt-get install build-essential gfortran \
         autoconf automake libtool autoconf-archive autotools-dev \
         maxima libblas-dev liblapack-dev \
         libglew-dev libsdl2-dev \
         libfcl-dev libompl-dev \
         sbcl \
         default-jdk \
         blender flex povray ffmpeg \
         coinor-libclp-dev libglpk-dev liblpsolve55-dev libnlopt-dev

Now proceed to Quicklisp Setup below.


Installation Errata {#installation_errata}
-------------------

Some package versions are missing features or contain minor bugs that
impede usage with amino.  A listing of issues encountered so far is
below:

### OMPL Missing Eigen dependency

Version 1.4.2 of OMPL and the corresponding Debian/Ubuntu packages are
missing a required dependency on libeigen.  To resolve, you may need
to do the following:

1. Manually install libeigen:

        sudo apt-get install libeigen3-dev

2. Manually add the eigen include directory to the ompl pkg-config
   file.  The ompl pkg-config file will typically be in
   `/usr/lib/x86_64-linux-gnu/pkgconfig/ompl.pc`.  The eigen include
   path will typically be `/usr/include/eigen3`.  Thus, you may change
   the Cflags entry in `/usr/lib/x86_64-linux-gnu/pkgconfig/ompl.pc`
   to:

        Cflags: -I${includedir} -I/usr/include/eigen3

### Blender Missing COLLADA Support

 Some versions of Blender in Ubuntu and Debian do not support the
COLLADA format for 3D meshes, so you may need to install Blender
manually in this case (see https://www.blender.org/download/).

### SBCL and CFFI incompatibility

The versions of SBCL in some distributions (e.g., SBCL 1.2.4 in Debian
Jessie) do not work with new versions of [CFFI]
(https://common-lisp.net/project/cffi/).  In these cases, you will
need to install SBCL manually (see
http://www.sbcl.org/platform-table.html).


Mac OS X {#installation_setup_mac}
--------

### Install Dependencies via Homebrew

If you use the [Homebrew] (http://brew.sh/) package manager, you can
install the dependencies as follows:

* Install packages:

        brew tap homebrew/science
        brew install autoconf-archive openblas maxima sdl2 libtool ompl
        brew install https://raw.github.com/dartsim/homebrew-dart/master/fcl.rb

* Set the CPPFLAGS variable so that the `cblas.h` header can be found:

        CPPFLAGS=-I/usr/local/opt/openblas/include

* Proceed to Blender Setup below

### Install Dependencies via MacPorts

If you use the [MacPorts] (https://www.macports.org/) package manager,
you can install the dependencies as follows:

* Install packages:

        sudo port install \
             coreutils wget \
             autoconf-archive maxima f2c flex sbcl  \
             OpenBLAS \
             libsdl2 povray ffmpeg  \
             fcl ompl \
             glpk

* Ensure that `LD_LIBRARY_PATH` or `DYLD_LIBRARY_PATH` contains the
  MacPorts lib directory (typically `/opt/local/lib`).

        echo $LD_LIBRARY_PATH
        echo $DYLD_LIBRARY_PATH

  If `/opt/local/lib` does not appear in either `LD_LIBRARY_PATH` or
  `DYLD_LIBRARY_PATH`, do the following (and consider adding it to
  your shell startup script).

        export LD_LIBRARY_PATH="/opt/local/lib:$LD_LIBRARY_PATH"

* Ensure that autoconf can find the MacPorts-installed header and
  library files by editing the `config.site` file under your preferred
  installation prefix (default: `/usr/local`)

        vi /usr/local/share/config.site

  Ensure that the `CPPFLAGS` and `LDFLAGS` variables in config.site
  contain the MacPorts directories.

        CPPFLAGS="-I/opt/local/include"
        LDFLAGS="-L/opt/local/lib"

* Proceed to Blender Setup below

### Blender Setup

* When installing blender on Mac OS X, you may need to create a
  wrapper script.  If you copy the blender binaries to
  `/usr/local/blender-2`, then then

        touch /usr/local/bin/blender
        chmod a+x /usr/local/bin/blender
        vi /usr/local/bin/blender

  and add the following:

        #!/bin/sh

        exec /usr/local/blender-2/blender.app/Contents/MacOS/blender $@

Now proceed to Quicklisp Setup below.

Quicklisp Setup {#installation_setup_quicklisp}
---------------

Finally, install [Quicklisp](https://www.quicklisp.org) manually, if
desired for ray tracing and robot model compilation.

    wget https://beta.quicklisp.org/quicklisp.lisp
    sbcl --load quicklisp.lisp \
         --eval '(quicklisp-quickstart:install)' \
         --eval '(ql:add-to-init-file)' \
         --eval '(quit)'

Build Overview {#installation_build_overview}
==============

1. If you have obtained amino from the git repo, you need to
   initialize the git submodules and autotools build scripts.

        git submodule init && git submodule update && autoreconf -i

   This step is not necessary when you have obtained a distribution
   tarball which already contains the submodule source tree and
   autoconf-generated configure script.

2. Configure for your system.  To see optional features which may be
   enabled or disabled, run:

        ./configure --help

   Then run configure (adding any flags you may need for your system):

        ./configure

3. Build:

        make

4. Install:

        sudo make install

    If you need to later uninstall amino, use the conventional `make
    uninstall` command.


Demo Programs {#installation_demo}
=============

The Amino distribution includes a number of demo programs.  Several of
these demos use URDF files which must be obtained separately.

Obtain URDF Files
-----------------

   * If you already have an existing ROS installation, you can install
     the `baxter_description` ROS package, for example on ROS Indigo:

            sudo apt-get install ros-indigo-baxter-description
            export ROS_PACKAGE_PATH=/opt/ros/indigo/share

   * An existing ROS installation is not necessary, however, and you
     can install only the baxter URDF and meshes:

            cd ..
            git clone https://github.com/RethinkRobotics/baxter_common
            export ROS_PACKAGE_PATH=`pwd`/baxter_common
            cd amino

Build Demos
-----------

1. (Re)-configure to enable demos:

        ./configure --enable-demos --enable-demo-baxter

   **Note:** On Mac OS X, due to dynamic loading issues, it may be
   necessary to first
   [build and install amino] (@ref installation_build_overview), and
   the re-configure and re-build amino with the demos enabled.
   Under GNU/Linux, it is generally possible to enable the demos
   during the initial build and without installing Amino beforehand.

2. Build:

        make

Run Demos
---------

Many demo programs may be built.  The following comand will list the built demos:

    find ./demo -type f -executable \
        -not  -name '*.so' \
        -not -path '*.libs*'

The `simple-scenefile` demo will lauch the @ref viewer with a simple
scene compiled from a scene file.

    ./demo/simple-rx/simple-scenefile

Several demos using the Baxter model show various features.  Each can
be invoked without arguments.

* `./demo/urdf/baxter/baxter-view` displays the baxter via dynamic loading
* `./demo/urdf/baxter/baxter-simple` via static linking
* `./demo/urdf/baxter/baxter-wksp` moves the baxter arm in workspace
* `./demo/urdf/baxter/baxter-collision` performs collision checking
* `./demo/urdf/baxter/baxter-ik` computes an inverse kinematics solution
* `./demo/urdf/baxter/baxter-ompl` computes a motion plan
* `./demo/urdf/baxter/baxter-ompl-workspace` computes a motion plan to a workspace goal
* `./demo/urdf/baxter/baxter-ompl-sequence` computes a sequence of motion plans

Tests {#installation_tests}
=====

Basic Tests
-----------

* To run the unit tests:

        make check

* To create and check the distribution tarball:

        make distcheck

Docker Tests
------------

Several [Docker] (https://www.docker.com/) files are included in
`./script/docker` which enable building testing amino in a container
with a clean OS installation.  These Dockerfiles are also used in the
[Continuous Integration] (https://travis-ci.org/golems/amino) tests.

* To build a docker image using the `script/docker/ubuntu-xenial`
  file:

        ./script/docker-build.sh ubuntu-xenial

* To build amino and run tests using docker image built from
  `script/docker/ubuntu-xenial` file:

        ./script/docker-check.sh ubuntu-xenial

Common Errors {#intallation_errors}
===================================

* `./configure` fails with when checking for cffi-grovel.

  - Older versions of SBCL (around 1.2.4) have issues with current
    versions of CFFI.  Please try installing a recent SBCL (>1.3.4).

* I get error messages about missing .obj files or Blender being
  unable to convert a .dae to Wavefront OBJ.

  - A: We use Blender to convert various mesh formats to Wavefront OBJ,
    then import the OBJ file.  The Blender binaries in the Debian and
    Ubuntu repositories (as of Jessie and Trusty) are not built with
    COLLADA (.dae) support.  You can download the prebuilt binaries
    from http://www.blender.org/ which do support COLLADA.

* When I try to compile a URDF file, I receive the error "aarx.core:
  not found".

  - A: URDF support in amino is only built if the necessary dependencies
    are installed.  Please ensure that you have SBCL, Quicklisp, and
    Sycamore installed and rebuild amino if necessary.

* When building `aarx.core`, I get an enormous stack trace, starting
  with:

        Unable to load any of the alternatives:
          ("libamino_planning.so" (:DEFAULT "libamino_planning"))

  - This means that SBCL is unable to load the planning library or one
    of its dependecies, such as OMPL.  Typically, this means your
    linker is not configured properly.

    Sometimes, you just need to run `ldconfig` or `sudo ldconfig` to
    update the linker cache.

    If `ldconfig` doesn't work, you can set the `LD_LIBRARY_PATH`
    variable.  First, find the location of libompl.so, e.g., by
    calling `locate libompl.so`.  Then, add the directory to your
    `LD_LIBRARY_PATH variable`.  Most commonly, this will mean adding
    one of the following lines to your shell startup files (e.g.,
    .bashrc):

            export LD_LIBRARY_PATH="/usr/local/lib/:$LD_LIBRARY_PATH"

            export LD_LIBRARY_PATH="/usr/local/lib/x86_64-linux-gnu/:$LD_LIBRARY_PATH"

* When building `aarx.core`, I get an enormous stack trace, starting
  with something like:

        Unable to load foreign library (LIBAMINO-PLANNING).
        Error opening shared object "libamino-planning.so":
        /home/user/workspace/amino/.libs/libamino-planning.so: undefined symbol: _ZNK4ompl4base20RealVectorStateSpace10getMeasureEv.

  - This error may occur when you have multiple incompatible versions
    of OMPL installed and the compiler finds one version while the
    runtime linker finds a different version.  Either modify your
    header (`-I`) and linking (`$LD_LIBRARY_PATH`) paths, or remove
    the additional versions of OMPL.

*******************************************************************

Generic Instructions for GNU Autotools {#installation_autotools}
======================================



Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
2006, 2007, 2008, 2009 Free Software Foundation, Inc.

   Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.  This file is offered as-is,
without warranty of any kind.

Basic Installation
==================

   Briefly, the shell commands `./configure; make; make install` should
configure, build, and install this package.  The following
more-detailed instructions are generic; see the `README` file for
instructions specific to this package.  Some packages provide this
`INSTALL` file but do not implement all of the features documented
below.  The lack of an optional feature in a given package is not
necessarily a bug.  More recommendations for GNU packages can be found
in *note Makefile Conventions: (standards)Makefile Conventions.

   The `configure` shell script attempts to guess correct values for
various system-dependent variables used during compilation.  It uses
those values to create a `Makefile` in each directory of the package.
It may also create one or more `.h` files containing system-dependent
definitions.  Finally, it creates a shell script `config.status` that
you can run in the future to recreate the current configuration, and a
file `config.log` containing compiler output (useful mainly for
debugging `configure`).

   It can also use an optional file (typically called `config.cache`
and enabled with `--cache-file=config.cache` or simply `-C`) that saves
the results of its tests to speed up reconfiguring.  Caching is
disabled by default to prevent problems with accidental use of stale
cache files.

   If you need to do unusual things to compile the package, please try
to figure out how `configure` could check whether to do them, and mail
diffs or instructions to the address given in the `README` so they can
be considered for the next release.  If you are using the cache, and at
some point `config.cache` contains results you don't want to keep, you
may remove or edit it.

   The file `configure.ac` (or `configure.in`) is used to create
`configure` by a program called `autoconf`.  You need `configure.ac` if
you want to change it or regenerate `configure` using a newer version
of `autoconf`.

   The simplest way to compile this package is:

  1. `cd` to the directory containing the package's source code and type
     `./configure` to configure the package for your system.

     Running `configure` might take a while.  While running, it prints
     some messages telling which features it is checking for.

  2. Type `make` to compile the package.

  3. Optionally, type `make check` to run any self-tests that come with
     the package, generally using the just-built uninstalled binaries.

  4. Type `make install` to install the programs and any data files and
     documentation.  When installing into a prefix owned by root, it is
     recommended that the package be configured and built as a regular
     user, and only the `make install` phase executed with root
     privileges.

  5. Optionally, type `make installcheck` to repeat any self-tests, but
     this time using the binaries in their final installed location.
     This target does not install anything.  Running this target as a
     regular user, particularly if the prior `make install` required
     root privileges, verifies that the installation completed
     correctly.

  6. You can remove the program binaries and object files from the
     source code directory by typing `make clean`.  To also remove the
     files that `configure` created (so you can compile the package for
     a different kind of computer), type `make distclean`.  There is
     also a `make maintainer-clean` target, but that is intended mainly
     for the package's developers.  If you use it, you may have to get
     all sorts of other programs in order to regenerate files that came
     with the distribution.

  7. Often, you can also type `make uninstall` to remove the installed
     files again.  In practice, not all packages have tested that
     uninstallation works correctly, even though it is required by the
     GNU Coding Standards.

  8. Some packages, particularly those that use Automake, provide `make
     distcheck`, which can by used by developers to test that all other
     targets like `make install` and `make uninstall` work correctly.
     This target is generally not run by end users.

Compilers and Options
=====================

   Some systems require unusual options for compilation or linking that
the `configure` script does not know about.  Run `./configure --help`
for details on some of the pertinent environment variables.

   You can give `configure` initial values for configuration parameters
by setting variables in the command line or in the environment.  Here
is an example:

     ./configure CC=c99 CFLAGS=-g LIBS=-lposix

   *Note Defining Variables::, for more details.

Compiling For Multiple Architectures
====================================

   You can compile the package for more than one kind of computer at the
same time, by placing the object files for each architecture in their
own directory.  To do this, you can use GNU `make`.  `cd` to the
directory where you want the object files and executables to go and run
the `configure` script.  `configure` automatically checks for the
source code in the directory that `configure` is in and in `..`.  This
is known as a "VPATH" build.

   With a non-GNU `make`, it is safer to compile the package for one
architecture at a time in the source code directory.  After you have
installed the package for one architecture, use `make distclean` before
reconfiguring for another architecture.

   On MacOS X 10.5 and later systems, you can create libraries and
executables that work on multiple system types--known as "fat" or
"universal" binaries--by specifying multiple `-arch` options to the
compiler but only a single `-arch` option to the preprocessor.  Like
this:

     ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
                 CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
                 CPP="gcc -E" CXXCPP="g++ -E"

   This is not guaranteed to produce working output in all cases, you
may have to build one architecture at a time and combine the results
using the `lipo` tool if you have problems.

Installation Names
==================

   By default, `make install` installs the package's commands under
`/usr/local/bin`, include files under `/usr/local/include`, etc.  You
can specify an installation prefix other than `/usr/local` by giving
`configure` the option `--prefix=PREFIX`, where PREFIX must be an
absolute file name.

   You can specify separate installation prefixes for
architecture-specific files and architecture-independent files.  If you
pass the option `--exec-prefix=PREFIX` to `configure`, the package uses
PREFIX as the prefix for installing programs and libraries.
Documentation and other data files still use the regular prefix.

   In addition, if you use an unusual directory layout you can give
options like `--bindir=DIR` to specify different values for particular
kinds of files.  Run `configure --help` for a list of the directories
you can set and what kinds of files go in them.  In general, the
default for these options is expressed in terms of `${prefix}`, so that
specifying just `--prefix` will affect all of the other directory
specifications that were not explicitly provided.

   The most portable way to affect installation locations is to pass the
correct locations to `configure`; however, many packages provide one or
both of the following shortcuts of passing variable assignments to the
`make install` command line to change installation locations without
having to reconfigure or recompile.

   The first method involves providing an override variable for each
affected directory.  For example, `make install
prefix=/alternate/directory` will choose an alternate location for all
directory configuration variables that were expressed in terms of
`${prefix}`.  Any directories that were specified during `configure`,
but not in terms of `${prefix}`, must each be overridden at install
time for the entire installation to be relocated.  The approach of
makefile variable overrides for each directory variable is required by
the GNU Coding Standards, and ideally causes no recompilation.
However, some platforms have known limitations with the semantics of
shared libraries that end up requiring recompilation when using this
method, particularly noticeable in packages that use GNU Libtool.

   The second method involves providing the `DESTDIR` variable.  For
example, `make install DESTDIR=/alternate/directory` will prepend
`/alternate/directory` before all installation names.  The approach of
`DESTDIR` overrides is not required by the GNU Coding Standards, and
does not work on platforms that have drive letters.  On the other hand,
it does better at avoiding recompilation issues, and works well even
when some directory options were not specified in terms of `${prefix}`
at `configure` time.

Optional Features
=================

   If the package supports it, you can cause programs to be installed
with an extra prefix or suffix on their names by giving `configure` the
option `--program-prefix=PREFIX` or `--program-suffix=SUFFIX`.

   Some packages pay attention to `--enable-FEATURE` options to
`configure`, where FEATURE indicates an optional part of the package.
They may also pay attention to `--with-PACKAGE` options, where PACKAGE
is something like `gnu-as` or `x` (for the X Window System).  The
`README` should mention any `--enable-` and `--with-` options that the
package recognizes.

   For packages that use the X Window System, `configure` can usually
find the X include and library files automatically, but if it doesn't,
you can use the `configure` options `--x-includes=DIR` and
`--x-libraries=DIR` to specify their locations.

   Some packages offer the ability to configure how verbose the
execution of `make` will be.  For these packages, running `./configure
--enable-silent-rules` sets the default to minimal output, which can be
overridden with `make V=1`; while running `./configure
--disable-silent-rules` sets the default to verbose, which can be
overridden with `make V=0`.

Particular systems
==================

   On HP-UX, the default C compiler is not ANSI C compatible.  If GNU
CC is not installed, it is recommended to use the following options in
order to use an ANSI C compiler:

     ./configure CC="cc -Ae -D_XOPEN_SOURCE=500"

and if that doesn't work, install pre-built binaries of GCC for HP-UX.

   On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
parse its `<wchar.h>` header file.  The option `-nodtk` can be used as
a workaround.  If GNU CC is not installed, it is therefore recommended
to try

     ./configure CC="cc"

and if that doesn't work, try

     ./configure CC="cc -nodtk"

   On Solaris, don't put `/usr/ucb` early in your `PATH`.  This
directory contains several dysfunctional programs; working variants of
these programs are available in `/usr/bin`.  So, if you need `/usr/ucb`
in your `PATH`, put it _after_ `/usr/bin`.

   On Haiku, software installed for all users goes in `/boot/common`,
not `/usr/local`.  It is recommended to use the following options:

     ./configure --prefix=/boot/common

Specifying the System Type
==========================

   There may be some features `configure` cannot figure out
automatically, but needs to determine by the type of machine the package
will run on.  Usually, assuming the package is built to be run on the
_same_ architectures, `configure` can figure that out, but if it prints
a message saying it cannot guess the machine type, give it the
`--build=TYPE` option.  TYPE can either be a short name for the system
type, such as `sun4`, or a canonical name which has the form:

     CPU-COMPANY-SYSTEM

where SYSTEM can have one of these forms:

     OS
     KERNEL-OS

   See the file `config.sub` for the possible values of each field.  If
`config.sub` isn't included in this package, then this package doesn't
need to know the machine type.

   If you are _building_ compiler tools for cross-compiling, you should
use the option `--target=TYPE` to select the type of system they will
produce code for.

   If you want to _use_ a cross compiler, that generates code for a
platform different from the build platform, you should specify the
"host" platform (i.e., that on which the generated programs will
eventually be run) with `--host=TYPE`.

Sharing Defaults
================

   If you want to set default values for `configure` scripts to share,
you can create a site shell script called `config.site` that gives
default values for variables like `CC`, `cache_file`, and `prefix`.
`configure` looks for `PREFIX/share/config.site` if it exists, then
`PREFIX/etc/config.site` if it exists.  Or, you can set the
`CONFIG_SITE` environment variable to the location of the site script.
A warning: not all `configure` scripts look for a site script.

Defining Variables
==================

   Variables not defined in a site shell script can be set in the
environment passed to `configure`.  However, some packages may run
configure again during the build, and the customized values of these
variables may be lost.  In order to avoid this problem, you should set
them in the `configure` command line, using `VAR=value`.  For example:

     ./configure CC=/usr/local2/bin/gcc

causes the specified `gcc` to be used as the C compiler (unless it is
overridden in the site shell script).

Unfortunately, this technique does not work for `CONFIG_SHELL` due to
an Autoconf bug.  Until the bug is fixed you can use this workaround:

     CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash

`configure` Invocation
======================

   `configure` recognizes the following options to control how it
operates.

    --help
    -h
         Print a summary of all of the options to `configure`, and exit.

    --help=short
    --help=recursive
         Print a summary of the options unique to this package's
         `configure`, and exit.  The `short` variant lists options used
         only in the top level, while the `recursive` variant lists options
         also present in any nested packages.

    --version
    -V
         Print the version of Autoconf used to generate the `configure`
         script, and exit.

    --cache-file=FILE
         Enable the cache: use and save the results of the tests in FILE,
         traditionally `config.cache`.  FILE defaults to `/dev/null` to
         disable caching.

    --config-cache
    -C
         Alias for `--cache-file=config.cache`.

    --quiet
    --silent
    -q
         Do not print messages saying which checks are being made.  To
         suppress all normal output, redirect it to `/dev/null` (any error
         messages will still be shown).

    --srcdir=DIR
         Look for the package's source code in directory DIR.  Usually
         `configure` can determine that directory automatically.

    --prefix=DIR
         Use DIR as the installation prefix.  *note Installation Names::
         for more details, including other options available for fine-tuning
         the installation locations.

    --no-create
    -n
         Run the configure checks, but stop before creating any output
         files.

    `configure` also accepts some other, not widely useful, options.  Run
    `configure --help` for more details.