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1 Basic Installation
2 ==================
3
4 These are generic installation instructions.
5
6 The `configure' shell script attempts to guess correct values for
7 various system-dependent variables used during compilation. It uses
8 those values to create a `Makefile' in each directory of the package.
9 It may also create one or more `.h' files containing system-dependent
10 definitions. Finally, it creates a shell script `config.status' that
11 you can run in the future to recreate the current configuration, and a
12 file `config.log' containing compiler output (useful mainly for
13 debugging `configure').
14
15 It can also use an optional file (typically called `config.cache'
16 and enabled with `--cache-file=config.cache' or simply `-C') that saves
17 the results of its tests to speed up reconfiguring. (Caching is
18 disabled by default to prevent problems with accidental use of stale
19 cache files.)
20
21 If you need to do unusual things to compile the package, please try
22 to figure out how `configure' could check whether to do them, and mail
23 diffs or instructions to the address given in the `README' so they can
24 be considered for the next release. If you are using the cache, and at
25 some point `config.cache' contains results you don't want to keep, you
26 may remove or edit it.
27
28 The file `configure.ac' (or `configure.in') is used to create
29 `configure' by a program called `autoconf'. You only need
30 `configure.ac' if you want to change it or regenerate `configure' using
31 a newer version of `autoconf'.
32
33 The simplest way to compile this package is:
34
35 1. `cd' to the directory containing the package's source code and type
36 `./configure' to configure the package for your system. If you're
37 using `csh' on an old version of System V, you might need to type
38 `sh ./configure' instead to prevent `csh' from trying to execute
39 `configure' itself.
40
41 Running `configure' takes awhile. While running, it prints some
42 messages telling which features it is checking for.
43
44 2. Type `make' to compile the package.
45
46 3. Optionally, type `make check' to run any self-tests that come with
47 the package.
48
49 4. Type `make install' to install the programs and any data files and
50 documentation.
51
52 5. You can remove the program binaries and object files from the
53 source code directory by typing `make clean'. To also remove the
54 files that `configure' created (so you can compile the package for
55 a different kind of computer), type `make distclean'. There is
56 also a `make maintainer-clean' target, but that is intended mainly
57 for the package's developers. If you use it, you may have to get
58 all sorts of other programs in order to regenerate files that came
59 with the distribution.
60
61 Compilers and Options
62 =====================
63
64 Some systems require unusual options for compilation or linking that
65 the `configure' script does not know about. Run `./configure --help'
66 for details on some of the pertinent environment variables.
67
68 You can give `configure' initial values for configuration parameters
69 by setting variables in the command line or in the environment. Here
70 is an example:
71
72 ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
73
74 *Note Defining Variables::, for more details.
75
76 Compiling For Multiple Architectures
77 ====================================
78
79 You can compile the package for more than one kind of computer at the
80 same time, by placing the object files for each architecture in their
81 own directory. To do this, you must use a version of `make' that
82 supports the `VPATH' variable, such as GNU `make'. `cd' to the
83 directory where you want the object files and executables to go and run
84 the `configure' script. `configure' automatically checks for the
85 source code in the directory that `configure' is in and in `..'.
86
87 If you have to use a `make' that does not support the `VPATH'
88 variable, you have to compile the package for one architecture at a
89 time in the source code directory. After you have installed the
90 package for one architecture, use `make distclean' before reconfiguring
91 for another architecture.
92
93 Installation Names
94 ==================
95
96 By default, `make install' will install the package's files in
97 `/usr/local/bin', `/usr/local/man', etc. You can specify an
98 installation prefix other than `/usr/local' by giving `configure' the
99 option `--prefix=PATH'.
100
101 You can specify separate installation prefixes for
102 architecture-specific files and architecture-independent files. If you
103 give `configure' the option `--exec-prefix=PATH', the package will use
104 PATH as the prefix for installing programs and libraries.
105 Documentation and other data files will still use the regular prefix.
106
107 In addition, if you use an unusual directory layout you can give
108 options like `--bindir=PATH' to specify different values for particular
109 kinds of files. Run `configure --help' for a list of the directories
110 you can set and what kinds of files go in them.
111
112 If the package supports it, you can cause programs to be installed
113 with an extra prefix or suffix on their names by giving `configure' the
114 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
115
116 Optional Features
117 =================
118
119 Some packages pay attention to `--enable-FEATURE' options to
120 `configure', where FEATURE indicates an optional part of the package.
121 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
122 is something like `gnu-as' or `x' (for the X Window System). The
123 `README' should mention any `--enable-' and `--with-' options that the
124 package recognizes.
125
126 For packages that use the X Window System, `configure' can usually
127 find the X include and library files automatically, but if it doesn't,
128 you can use the `configure' options `--x-includes=DIR' and
129 `--x-libraries=DIR' to specify their locations.
130
131 Specifying the System Type
132 ==========================
133
134 There may be some features `configure' cannot figure out
135 automatically, but needs to determine by the type of machine the package
136 will run on. Usually, assuming the package is built to be run on the
137 _same_ architectures, `configure' can figure that out, but if it prints
138 a message saying it cannot guess the machine type, give it the
139 `--build=TYPE' option. TYPE can either be a short name for the system
140 type, such as `sun4', or a canonical name which has the form:
141
142 CPU-COMPANY-SYSTEM
143
144 where SYSTEM can have one of these forms:
145
146 OS KERNEL-OS
147
148 See the file `config.sub' for the possible values of each field. If
149 `config.sub' isn't included in this package, then this package doesn't
150 need to know the machine type.
151
152 If you are _building_ compiler tools for cross-compiling, you should
153 use the `--target=TYPE' option to select the type of system they will
154 produce code for.
155
156 If you want to _use_ a cross compiler, that generates code for a
157 platform different from the build platform, you should specify the
158 "host" platform (i.e., that on which the generated programs will
159 eventually be run) with `--host=TYPE'.
160
161 Sharing Defaults
162 ================
163
164 If you want to set default values for `configure' scripts to share,
165 you can create a site shell script called `config.site' that gives
166 default values for variables like `CC', `cache_file', and `prefix'.
167 `configure' looks for `PREFIX/share/config.site' if it exists, then
168 `PREFIX/etc/config.site' if it exists. Or, you can set the
169 `CONFIG_SITE' environment variable to the location of the site script.
170 A warning: not all `configure' scripts look for a site script.
171
172 Defining Variables
173 ==================
174
175 Variables not defined in a site shell script can be set in the
176 environment passed to `configure'. However, some packages may run
177 configure again during the build, and the customized values of these
178 variables may be lost. In order to avoid this problem, you should set
179 them in the `configure' command line, using `VAR=value'. For example:
180
181 ./configure CC=/usr/local2/bin/gcc
182
183 will cause the specified gcc to be used as the C compiler (unless it is
184 overridden in the site shell script).
185
186 `configure' Invocation
187 ======================
188
189 `configure' recognizes the following options to control how it
190 operates.
191
192 `--help'
193 `-h'
194 Print a summary of the options to `configure', and exit.
195
196 `--version'
197 `-V'
198 Print the version of Autoconf used to generate the `configure'
199 script, and exit.
200
201 `--cache-file=FILE'
202 Enable the cache: use and save the results of the tests in FILE,
203 traditionally `config.cache'. FILE defaults to `/dev/null' to
204 disable caching.
205
206 `--config-cache'
207 `-C'
208 Alias for `--cache-file=config.cache'.
209
210 `--quiet'
211 `--silent'
212 `-q'
213 Do not print messages saying which checks are being made. To
214 suppress all normal output, redirect it to `/dev/null' (any error
215 messages will still be shown).
216
217 `--srcdir=DIR'
218 Look for the package's source code in directory DIR. Usually
219 `configure' can determine that directory automatically.
220
221 `configure' also accepts some other, not widely useful, options. Run
222 `configure --help' for more details.
223
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