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1 Copyright 1994, 1995, 1996, 1999, 2000, 2001 Free Software Foundation,
2 Inc.
4 This file is free documentation; the Free Software Foundation gives
5 unlimited permission to copy, distribute and modify it.
7 Basic Installation
8 ==================
10 These are generic installation instructions.
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').
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.)
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.
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'.
39 The simplest way to compile this package is:
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.
47 Running `configure' takes awhile. While running, it prints some
48 messages telling which features it is checking for.
50 2. Type `make' to compile the package.
52 3. Optionally, type `make check' to run any self-tests that come with
53 the package.
55 4. Type `make install' to install the programs and any data files and
56 documentation.
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.
67 Compilers and Options
68 =====================
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.
74 You can give `configure' initial values for variables by setting
75 them in the environment. You can do that on the command line like this:
77 ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
79 *Note Defining Variables::, for more details.
81 Compiling For Multiple Architectures
82 ====================================
84 You can compile the package for more than one kind of computer at the
85 same time, by placing the object files for each architecture in their
86 own directory. To do this, you must use a version of `make' that
87 supports the `VPATH' variable, such as GNU `make'. `cd' to the
88 directory where you want the object files and executables to go and run
89 the `configure' script. `configure' automatically checks for the
90 source code in the directory that `configure' is in and in `..'.
92 If you have to use a `make' that does not support the `VPATH'
93 variable, you have to compile the package for one architecture at a
94 time in the source code directory. After you have installed the
95 package for one architecture, use `make distclean' before reconfiguring
96 for another architecture.
98 Installation Names
99 ==================
101 By default, `make install' will install the package's files in
102 `/usr/local/bin', `/usr/local/man', etc. You can specify an
103 installation prefix other than `/usr/local' by giving `configure' the
104 option `--prefix=PATH'.
106 You can specify separate installation prefixes for
107 architecture-specific files and architecture-independent files. If you
108 give `configure' the option `--exec-prefix=PATH', the package will use
109 PATH as the prefix for installing programs and libraries.
110 Documentation and other data files will still use the regular prefix.
112 In addition, if you use an unusual directory layout you can give
113 options like `--bindir=PATH' to specify different values for particular
114 kinds of files. Run `configure --help' for a list of the directories
115 you can set and what kinds of files go in them.
117 If the package supports it, you can cause programs to be installed
118 with an extra prefix or suffix on their names by giving `configure' the
119 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
121 Optional Features
122 =================
124 Some packages pay attention to `--enable-FEATURE' options to
125 `configure', where FEATURE indicates an optional part of the package.
126 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
127 is something like `gnu-as' or `x' (for the X Window System). The
128 `README' should mention any `--enable-' and `--with-' options that the
129 package recognizes.
131 For packages that use the X Window System, `configure' can usually
132 find the X include and library files automatically, but if it doesn't,
133 you can use the `configure' options `--x-includes=DIR' and
134 `--x-libraries=DIR' to specify their locations.
136 Specifying the System Type
137 ==========================
139 There may be some features `configure' cannot figure out
140 automatically, but needs to determine by the type of host the package
141 will run on. Usually `configure' can figure that out, but if it prints
142 a message saying it cannot guess the host type, give it the
143 `--build=TYPE' option. TYPE can either be a short name for the system
144 type, such as `sun4', or a canonical name which has the form:
146 CPU-COMPANY-SYSTEM
148 where SYSTEM can have one of these forms:
150 OS KERNEL-OS
152 See the file `config.sub' for the possible values of each field. If
153 `config.sub' isn't included in this package, then this package doesn't
154 need to know the host type.
156 If you are _building_ compiler tools for cross-compiling, you should
157 use the `--target=TYPE' option to select the type of system they will
158 produce code for.
160 If you want to _use_ a cross compiler, that generates code for a
161 platform different from the build platform, you should specify the host
162 platform (i.e., that on which the generated programs will eventually be
163 run) with `--host=TYPE'. In this case, you should also specify the
164 build platform with `--build=TYPE', because, in this case, it may not
165 be possible to guess the build platform (it sometimes involves
166 compiling and running simple test programs, and this can't be done if
167 the compiler is a cross compiler).
169 Sharing Defaults
170 ================
172 If you want to set default values for `configure' scripts to share,
173 you can create a site shell script called `config.site' that gives
174 default values for variables like `CC', `cache_file', and `prefix'.
175 `configure' looks for `PREFIX/share/config.site' if it exists, then
176 `PREFIX/etc/config.site' if it exists. Or, you can set the
177 `CONFIG_SITE' environment variable to the location of the site script.
178 A warning: not all `configure' scripts look for a site script.
180 Defining Variables
181 ==================
183 Variables not defined in a site shell script can be set in the
184 environment passed to `configure'. However, some packages may run
185 configure again during the build, and the customized values of these
186 variables may be lost. In order to avoid this problem, you should set
187 them in the `configure' command line, using `VAR=value'. For example:
189 ./configure CC=/usr/local2/bin/gcc
191 will cause the specified gcc to be used as the C compiler (unless it is
192 overridden in the site shell script).
194 `configure' Invocation
195 ======================
197 `configure' recognizes the following options to control how it
198 operates.
200 `--help'
201 `-h'
202 Print a summary of the options to `configure', and exit.
204 `--version'
205 `-V'
206 Print the version of Autoconf used to generate the `configure'
207 script, and exit.
209 `--cache-file=FILE'
210 Enable the cache: use and save the results of the tests in FILE,
211 traditionally `config.cache'. FILE defaults to `/dev/null' to
212 disable caching.
214 `--config-cache'
215 `-C'
216 Alias for `--cache-file=config.cache'.
218 `--quiet'
219 `--silent'
220 `-q'
221 Do not print messages saying which checks are being made. To
222 suppress all normal output, redirect it to `/dev/null' (any error
223 messages will still be shown).
225 `--srcdir=DIR'
226 Look for the package's source code in directory DIR. Usually
227 `configure' can determine that directory automatically.
229 `configure' also accepts some other, not widely useful, options. Run
230 `configure --help' for more details.