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      1 Installation Instructions
      2 *************************
      3 
      4 Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005 Free
      5 Software Foundation, Inc.
      6 
      7 This file is free documentation; the Free Software Foundation gives
      8 unlimited permission to copy, distribute and modify it.
      9 
     10 Basic Installation
     11 ==================
     12 
     13 These are generic installation instructions.
     14 
     15    The `configure' shell script attempts to guess correct values for
     16 various system-dependent variables used during compilation.  It uses
     17 those values to create a `Makefile' in each directory of the package.
     18 It may also create one or more `.h' files containing system-dependent
     19 definitions.  Finally, it creates a shell script `config.status' that
     20 you can run in the future to recreate the current configuration, and a
     21 file `config.log' containing compiler output (useful mainly for
     22 debugging `configure').
     23 
     24    It can also use an optional file (typically called `config.cache'
     25 and enabled with `--cache-file=config.cache' or simply `-C') that saves
     26 the results of its tests to speed up reconfiguring.  (Caching is
     27 disabled by default to prevent problems with accidental use of stale
     28 cache files.)
     29 
     30    If you need to do unusual things to compile the package, please try
     31 to figure out how `configure' could check whether to do them, and mail
     32 diffs or instructions to the address given in the `README' so they can
     33 be considered for the next release.  If you are using the cache, and at
     34 some point `config.cache' contains results you don't want to keep, you
     35 may remove or edit it.
     36 
     37    The file `configure.ac' (or `configure.in') is used to create
     38 `configure' by a program called `autoconf'.  You only need
     39 `configure.ac' if you want to change it or regenerate `configure' using
     40 a newer version of `autoconf'.
     41 
     42 The simplest way to compile this package is:
     43 
     44   1. `cd' to the directory containing the package's source code and type
     45      `./configure' to configure the package for your system.  If you're
     46      using `csh' on an old version of System V, you might need to type
     47      `sh ./configure' instead to prevent `csh' from trying to execute
     48      `configure' itself.
     49 
     50      Running `configure' takes awhile.  While running, it prints some
     51      messages telling which features it is checking for.
     52 
     53   2. Type `make' to compile the package.
     54 
     55   3. Optionally, type `make check' to run any self-tests that come with
     56      the package.
     57 
     58   4. Type `make install' to install the programs and any data files and
     59      documentation.
     60 
     61   5. You can remove the program binaries and object files from the
     62      source code directory by typing `make clean'.  To also remove the
     63      files that `configure' created (so you can compile the package for
     64      a different kind of computer), type `make distclean'.  There is
     65      also a `make maintainer-clean' target, but that is intended mainly
     66      for the package's developers.  If you use it, you may have to get
     67      all sorts of other programs in order to regenerate files that came
     68      with the distribution.
     69 
     70 Compilers and Options
     71 =====================
     72 
     73 Some systems require unusual options for compilation or linking that the
     74 `configure' script does not know about.  Run `./configure --help' for
     75 details on some of the pertinent environment variables.
     76 
     77    You can give `configure' initial values for configuration parameters
     78 by setting variables in the command line or in the environment.  Here
     79 is an example:
     80 
     81      ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
     82 
     83    *Note Defining Variables::, for more details.
     84 
     85 Compiling For Multiple Architectures
     86 ====================================
     87 
     88 You can compile the package for more than one kind of computer at the
     89 same time, by placing the object files for each architecture in their
     90 own directory.  To do this, you must use a version of `make' that
     91 supports the `VPATH' variable, such as GNU `make'.  `cd' to the
     92 directory where you want the object files and executables to go and run
     93 the `configure' script.  `configure' automatically checks for the
     94 source code in the directory that `configure' is in and in `..'.
     95 
     96    If you have to use a `make' that does not support the `VPATH'
     97 variable, you have to compile the package for one architecture at a
     98 time in the source code directory.  After you have installed the
     99 package for one architecture, use `make distclean' before reconfiguring
    100 for another architecture.
    101 
    102 Installation Names
    103 ==================
    104 
    105 By default, `make install' installs the package's commands under
    106 `/usr/local/bin', include files under `/usr/local/include', etc.  You
    107 can specify an installation prefix other than `/usr/local' by giving
    108 `configure' the option `--prefix=PREFIX'.
    109 
    110    You can specify separate installation prefixes for
    111 architecture-specific files and architecture-independent files.  If you
    112 pass the option `--exec-prefix=PREFIX' to `configure', the package uses
    113 PREFIX as the prefix for installing programs and libraries.
    114 Documentation and other data files still use the regular prefix.
    115 
    116    In addition, if you use an unusual directory layout you can give
    117 options like `--bindir=DIR' to specify different values for particular
    118 kinds of files.  Run `configure --help' for a list of the directories
    119 you can set and what kinds of files go in them.
    120 
    121    If the package supports it, you can cause programs to be installed
    122 with an extra prefix or suffix on their names by giving `configure' the
    123 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
    124 
    125 Optional Features
    126 =================
    127 
    128 Some packages pay attention to `--enable-FEATURE' options to
    129 `configure', where FEATURE indicates an optional part of the package.
    130 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
    131 is something like `gnu-as' or `x' (for the X Window System).  The
    132 `README' should mention any `--enable-' and `--with-' options that the
    133 package recognizes.
    134 
    135    For packages that use the X Window System, `configure' can usually
    136 find the X include and library files automatically, but if it doesn't,
    137 you can use the `configure' options `--x-includes=DIR' and
    138 `--x-libraries=DIR' to specify their locations.
    139 
    140 Specifying the System Type
    141 ==========================
    142 
    143 There may be some features `configure' cannot figure out automatically,
    144 but needs to determine by the type of machine the package will run on.
    145 Usually, assuming the package is built to be run on the _same_
    146 architectures, `configure' can figure that out, but if it prints a
    147 message saying it cannot guess the machine type, give it the
    148 `--build=TYPE' option.  TYPE can either be a short name for the system
    149 type, such as `sun4', or a canonical name which has the form:
    150 
    151      CPU-COMPANY-SYSTEM
    152 
    153 where SYSTEM can have one of these forms:
    154 
    155      OS KERNEL-OS
    156 
    157    See the file `config.sub' for the possible values of each field.  If
    158 `config.sub' isn't included in this package, then this package doesn't
    159 need to know the machine type.
    160 
    161    If you are _building_ compiler tools for cross-compiling, you should
    162 use the option `--target=TYPE' to select the type of system they will
    163 produce code for.
    164 
    165    If you want to _use_ a cross compiler, that generates code for a
    166 platform different from the build platform, you should specify the
    167 "host" platform (i.e., that on which the generated programs will
    168 eventually be run) with `--host=TYPE'.
    169 
    170 Sharing Defaults
    171 ================
    172 
    173 If you want to set default values for `configure' scripts to share, you
    174 can create a site shell script called `config.site' that gives default
    175 values for variables like `CC', `cache_file', and `prefix'.
    176 `configure' looks for `PREFIX/share/config.site' if it exists, then
    177 `PREFIX/etc/config.site' if it exists.  Or, you can set the
    178 `CONFIG_SITE' environment variable to the location of the site script.
    179 A warning: not all `configure' scripts look for a site script.
    180 
    181 Defining Variables
    182 ==================
    183 
    184 Variables not defined in a site shell script can be set in the
    185 environment passed to `configure'.  However, some packages may run
    186 configure again during the build, and the customized values of these
    187 variables may be lost.  In order to avoid this problem, you should set
    188 them in the `configure' command line, using `VAR=value'.  For example:
    189 
    190      ./configure CC=/usr/local2/bin/gcc
    191 
    192 causes the specified `gcc' to be used as the C compiler (unless it is
    193 overridden in the site shell script).  Here is a another example:
    194 
    195      /bin/bash ./configure CONFIG_SHELL=/bin/bash
    196 
    197 Here the `CONFIG_SHELL=/bin/bash' operand causes subsequent
    198 configuration-related scripts to be executed by `/bin/bash'.
    199 
    200 `configure' Invocation
    201 ======================
    202 
    203 `configure' recognizes the following options to control how it operates.
    204 
    205 `--help'
    206 `-h'
    207      Print a summary of the options to `configure', and exit.
    208 
    209 `--version'
    210 `-V'
    211      Print the version of Autoconf used to generate the `configure'
    212      script, and exit.
    213 
    214 `--cache-file=FILE'
    215      Enable the cache: use and save the results of the tests in FILE,
    216      traditionally `config.cache'.  FILE defaults to `/dev/null' to
    217      disable caching.
    218 
    219 `--config-cache'
    220 `-C'
    221      Alias for `--cache-file=config.cache'.
    222 
    223 `--quiet'
    224 `--silent'
    225 `-q'
    226      Do not print messages saying which checks are being made.  To
    227      suppress all normal output, redirect it to `/dev/null' (any error
    228      messages will still be shown).
    229 
    230 `--srcdir=DIR'
    231      Look for the package's source code in directory DIR.  Usually
    232      `configure' can determine that directory automatically.
    233 
    234 `configure' also accepts some other, not widely useful, options.  Run
    235 `configure --help' for more details.
    236 
    237