annotate INSTALL @ 232:1009f302ac11

Documented the "Flags" term for object files
author lost
date Fri, 12 Jun 2009 04:17:22 +0000
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1 Installation Instructions
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2 *************************
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3
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4 Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
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5 2006, 2007 Free Software Foundation, Inc.
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6
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7 This file is free documentation; the Free Software Foundation gives
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8 unlimited permission to copy, distribute and modify it.
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9
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10 Basic Installation
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11 ==================
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12
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13 Briefly, the shell commands `./configure; make; make install' should
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14 configure, build, and install this package. The following
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15 more-detailed instructions are generic; see the `README' file for
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16 instructions specific to this package.
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17
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18 The `configure' shell script attempts to guess correct values for
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19 various system-dependent variables used during compilation. It uses
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20 those values to create a `Makefile' in each directory of the package.
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21 It may also create one or more `.h' files containing system-dependent
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22 definitions. Finally, it creates a shell script `config.status' that
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23 you can run in the future to recreate the current configuration, and a
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24 file `config.log' containing compiler output (useful mainly for
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25 debugging `configure').
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26
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27 It can also use an optional file (typically called `config.cache'
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28 and enabled with `--cache-file=config.cache' or simply `-C') that saves
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29 the results of its tests to speed up reconfiguring. Caching is
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30 disabled by default to prevent problems with accidental use of stale
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31 cache files.
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32
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33 If you need to do unusual things to compile the package, please try
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34 to figure out how `configure' could check whether to do them, and mail
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35 diffs or instructions to the address given in the `README' so they can
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36 be considered for the next release. If you are using the cache, and at
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37 some point `config.cache' contains results you don't want to keep, you
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38 may remove or edit it.
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39
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40 The file `configure.ac' (or `configure.in') is used to create
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41 `configure' by a program called `autoconf'. You need `configure.ac' if
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42 you want to change it or regenerate `configure' using a newer version
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43 of `autoconf'.
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44
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45 The simplest way to compile this package is:
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46
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47 1. `cd' to the directory containing the package's source code and type
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48 `./configure' to configure the package for your system.
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49
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50 Running `configure' might take a while. While running, it prints
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51 some messages telling which features it is checking for.
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52
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53 2. Type `make' to compile the package.
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54
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55 3. Optionally, type `make check' to run any self-tests that come with
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56 the package.
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57
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58 4. Type `make install' to install the programs and any data files and
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59 documentation.
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60
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61 5. You can remove the program binaries and object files from the
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62 source code directory by typing `make clean'. To also remove the
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63 files that `configure' created (so you can compile the package for
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64 a different kind of computer), type `make distclean'. There is
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65 also a `make maintainer-clean' target, but that is intended mainly
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66 for the package's developers. If you use it, you may have to get
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67 all sorts of other programs in order to regenerate files that came
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68 with the distribution.
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69
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70 6. Often, you can also type `make uninstall' to remove the installed
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71 files again.
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72
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73 Compilers and Options
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74 =====================
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75
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76 Some systems require unusual options for compilation or linking that the
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77 `configure' script does not know about. Run `./configure --help' for
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78 details on some of the pertinent environment variables.
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79
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80 You can give `configure' initial values for configuration parameters
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81 by setting variables in the command line or in the environment. Here
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82 is an example:
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83
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84 ./configure CC=c99 CFLAGS=-g LIBS=-lposix
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85
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86 *Note Defining Variables::, for more details.
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87
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88 Compiling For Multiple Architectures
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89 ====================================
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90
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91 You can compile the package for more than one kind of computer at the
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92 same time, by placing the object files for each architecture in their
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93 own directory. To do this, you can use GNU `make'. `cd' to the
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94 directory where you want the object files and executables to go and run
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95 the `configure' script. `configure' automatically checks for the
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96 source code in the directory that `configure' is in and in `..'.
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97
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98 With a non-GNU `make', it is safer to compile the package for one
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99 architecture at a time in the source code directory. After you have
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100 installed the package for one architecture, use `make distclean' before
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101 reconfiguring for another architecture.
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102
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103 Installation Names
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104 ==================
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105
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106 By default, `make install' installs the package's commands under
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107 `/usr/local/bin', include files under `/usr/local/include', etc. You
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108 can specify an installation prefix other than `/usr/local' by giving
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109 `configure' the option `--prefix=PREFIX'.
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110
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111 You can specify separate installation prefixes for
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112 architecture-specific files and architecture-independent files. If you
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113 pass the option `--exec-prefix=PREFIX' to `configure', the package uses
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114 PREFIX as the prefix for installing programs and libraries.
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115 Documentation and other data files still use the regular prefix.
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116
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117 In addition, if you use an unusual directory layout you can give
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118 options like `--bindir=DIR' to specify different values for particular
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119 kinds of files. Run `configure --help' for a list of the directories
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120 you can set and what kinds of files go in them.
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121
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122 If the package supports it, you can cause programs to be installed
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123 with an extra prefix or suffix on their names by giving `configure' the
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124 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
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125
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126 Optional Features
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127 =================
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128
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129 Some packages pay attention to `--enable-FEATURE' options to
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130 `configure', where FEATURE indicates an optional part of the package.
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131 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
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132 is something like `gnu-as' or `x' (for the X Window System). The
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133 `README' should mention any `--enable-' and `--with-' options that the
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134 package recognizes.
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135
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136 For packages that use the X Window System, `configure' can usually
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137 find the X include and library files automatically, but if it doesn't,
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138 you can use the `configure' options `--x-includes=DIR' and
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139 `--x-libraries=DIR' to specify their locations.
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140
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141 Specifying the System Type
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142 ==========================
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143
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144 There may be some features `configure' cannot figure out automatically,
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145 but needs to determine by the type of machine the package will run on.
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146 Usually, assuming the package is built to be run on the _same_
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147 architectures, `configure' can figure that out, but if it prints a
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148 message saying it cannot guess the machine type, give it the
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149 `--build=TYPE' option. TYPE can either be a short name for the system
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150 type, such as `sun4', or a canonical name which has the form:
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151
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152 CPU-COMPANY-SYSTEM
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153
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154 where SYSTEM can have one of these forms:
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155
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156 OS KERNEL-OS
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157
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158 See the file `config.sub' for the possible values of each field. If
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159 `config.sub' isn't included in this package, then this package doesn't
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160 need to know the machine type.
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161
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162 If you are _building_ compiler tools for cross-compiling, you should
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163 use the option `--target=TYPE' to select the type of system they will
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164 produce code for.
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165
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166 If you want to _use_ a cross compiler, that generates code for a
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167 platform different from the build platform, you should specify the
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168 "host" platform (i.e., that on which the generated programs will
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169 eventually be run) with `--host=TYPE'.
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170
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171 Sharing Defaults
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172 ================
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173
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174 If you want to set default values for `configure' scripts to share, you
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175 can create a site shell script called `config.site' that gives default
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176 values for variables like `CC', `cache_file', and `prefix'.
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177 `configure' looks for `PREFIX/share/config.site' if it exists, then
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178 `PREFIX/etc/config.site' if it exists. Or, you can set the
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179 `CONFIG_SITE' environment variable to the location of the site script.
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180 A warning: not all `configure' scripts look for a site script.
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181
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182 Defining Variables
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183 ==================
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184
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185 Variables not defined in a site shell script can be set in the
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186 environment passed to `configure'. However, some packages may run
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187 configure again during the build, and the customized values of these
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188 variables may be lost. In order to avoid this problem, you should set
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189 them in the `configure' command line, using `VAR=value'. For example:
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190
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191 ./configure CC=/usr/local2/bin/gcc
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192
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193 causes the specified `gcc' to be used as the C compiler (unless it is
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194 overridden in the site shell script).
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195
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196 Unfortunately, this technique does not work for `CONFIG_SHELL' due to
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197 an Autoconf bug. Until the bug is fixed you can use this workaround:
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198
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199 CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
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200
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201 `configure' Invocation
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202 ======================
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203
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204 `configure' recognizes the following options to control how it operates.
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205
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206 `--help'
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207 `-h'
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208 Print a summary of the options to `configure', and exit.
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209
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210 `--version'
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211 `-V'
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212 Print the version of Autoconf used to generate the `configure'
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213 script, and exit.
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214
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215 `--cache-file=FILE'
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216 Enable the cache: use and save the results of the tests in FILE,
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217 traditionally `config.cache'. FILE defaults to `/dev/null' to
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218 disable caching.
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219
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220 `--config-cache'
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221 `-C'
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222 Alias for `--cache-file=config.cache'.
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223
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224 `--quiet'
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225 `--silent'
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226 `-q'
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227 Do not print messages saying which checks are being made. To
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228 suppress all normal output, redirect it to `/dev/null' (any error
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229 messages will still be shown).
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230
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231 `--srcdir=DIR'
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232 Look for the package's source code in directory DIR. Usually
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233 `configure' can determine that directory automatically.
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234
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235 `configure' also accepts some other, not widely useful, options. Run
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236 `configure --help' for more details.
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237