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