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

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