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

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