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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