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1Copyright 1994, 1995, 1996, 1999, 2000, 2001 Free Software Foundation,
2Inc.
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 variables by setting
65 env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure 75them in the environment. You can do that on the command line like this:
76
77 ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
78
79 *Note Defining Variables::, for more details.
66 80
67Compiling For Multiple Architectures 81Compiling For Multiple Architectures
68==================================== 82====================================
69 83
70 You can compile the package for more than one kind of computer at the 84 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 87supports the `VPATH' variable, such as GNU `make'. `cd' to the
74directory where you want the object files and executables to go and run 88directory where you want the object files and executables to go and run
75the `configure' script. `configure' automatically checks for the 89the `configure' script. `configure' automatically checks for the
76source code in the directory that `configure' is in and in `..'. 90source code in the directory that `configure' is in and in `..'.
77 91
78 If you have to use a `make' that does not supports the `VPATH' 92 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 93variable, you have to compile the package for one architecture at a
80in the source code directory. After you have installed the package for 94time in the source code directory. After you have installed the
81one architecture, use `make distclean' before reconfiguring for another 95package for one architecture, use `make distclean' before reconfiguring
82architecture. 96for another architecture.
83 97
84Installation Names 98Installation Names
85================== 99==================
86 100
87 By default, `make install' will install the package's files in 101 By default, `make install' will install the package's files in
120`--x-libraries=DIR' to specify their locations. 134`--x-libraries=DIR' to specify their locations.
121 135
122Specifying the System Type 136Specifying the System Type
123========================== 137==========================
124 138
125 There may be some features `configure' can not figure out 139 There may be some features `configure' cannot figure out
126automatically, but needs to determine by the type of host the package 140automatically, but needs to determine by the type of host the package
127will run on. Usually `configure' can figure that out, but if it prints 141will run on. Usually `configure' can figure that out, but if it prints
128a message saying it can not guess the host type, give it the 142a message saying it cannot guess the host type, give it the
129`--host=TYPE' option. TYPE can either be a short name for the system 143`--build=TYPE' option. TYPE can either be a short name for the system
130type, such as `sun4', or a canonical name with three fields: 144type, such as `sun4', or a canonical name which has the form:
145
131 CPU-COMPANY-SYSTEM 146 CPU-COMPANY-SYSTEM
132 147
148where SYSTEM can have one of these forms:
149
150 OS KERNEL-OS
151
133See the file `config.sub' for the possible values of each field. If 152 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 153`config.sub' isn't included in this package, then this package doesn't
135need to know the host type. 154need to know the host type.
136 155
137 If you are building compiler tools for cross-compiling, you can also 156 If you are _building_ compiler tools for cross-compiling, you should
138use the `--target=TYPE' option to select the type of system they will 157use 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 158produce code for.
140system on which you are compiling the package. 159
160 If you want to _use_ a cross compiler, that generates code for a
161platform different from the build platform, you should specify the host
162platform (i.e., that on which the generated programs will eventually be
163run) with `--host=TYPE'. In this case, you should also specify the
164build platform with `--build=TYPE', because, in this case, it may not
165be possible to guess the build platform (it sometimes involves
166compiling and running simple test programs, and this can't be done if
167the compiler is a cross compiler).
141 168
142Sharing Defaults 169Sharing Defaults
143================ 170================
144 171
145 If you want to set default values for `configure' scripts to share, 172 If you want to set default values for `configure' scripts to share,
148`configure' looks for `PREFIX/share/config.site' if it exists, then 175`configure' looks for `PREFIX/share/config.site' if it exists, then
149`PREFIX/etc/config.site' if it exists. Or, you can set the 176`PREFIX/etc/config.site' if it exists. Or, you can set the
150`CONFIG_SITE' environment variable to the location of the site script. 177`CONFIG_SITE' environment variable to the location of the site script.
151A warning: not all `configure' scripts look for a site script. 178A warning: not all `configure' scripts look for a site script.
152 179
153Operation Controls 180Defining Variables
154================== 181==================
182
183 Variables not defined in a site shell script can be set in the
184environment passed to `configure'. However, some packages may run
185configure again during the build, and the customized values of these
186variables may be lost. In order to avoid this problem, you should set
187them in the `configure' command line, using `VAR=value'. For example:
188
189 ./configure CC=/usr/local2/bin/gcc
190
191will cause the specified gcc to be used as the C compiler (unless it is
192overridden in the site shell script).
193
194`configure' Invocation
195======================
155 196
156 `configure' recognizes the following options to control how it 197 `configure' recognizes the following options to control how it
157operates. 198operates.
158 199
200`--help'
201`-h'
202 Print a summary of the options to `configure', and exit.
203
204`--version'
205`-V'
206 Print the version of Autoconf used to generate the `configure'
207 script, and exit.
208
159`--cache-file=FILE' 209`--cache-file=FILE'
160 Use and save the results of the tests in FILE instead of 210 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 211 traditionally `config.cache'. FILE defaults to `/dev/null' to
162 debugging `configure'. 212 disable caching.
163 213
164`--help' 214`--config-cache'
165 Print a summary of the options to `configure', and exit. 215`-C'
216 Alias for `--cache-file=config.cache'.
166 217
167`--quiet' 218`--quiet'
168`--silent' 219`--silent'
169`-q' 220`-q'
170 Do not print messages saying which checks are being made. To 221 Do not print messages saying which checks are being made. To
173 224
174`--srcdir=DIR' 225`--srcdir=DIR'
175 Look for the package's source code in directory DIR. Usually 226 Look for the package's source code in directory DIR. Usually
176 `configure' can determine that directory automatically. 227 `configure' can determine that directory automatically.
177 228
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. 229`configure' also accepts some other, not widely useful, options. Run
230`configure --help' for more details.
231

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