1 | Basic Installation |
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2 | ================== |
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3 | |
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4 | These are generic installation instructions. |
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5 | |
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6 | The `configure' shell script attempts to guess correct values for |
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7 | various system-dependent variables used during compilation. It uses |
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8 | those values to create a `Makefile' in each directory of the package. |
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9 | It may also create one or more `.h' files containing system-dependent |
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10 | definitions. Finally, it creates a shell script `config.status' that |
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11 | you can run in the future to recreate the current configuration, and a |
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12 | file `config.log' containing compiler output (useful mainly for |
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13 | debugging `configure'). |
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14 | |
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15 | It can also use an optional file (typically called `config.cache' |
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16 | and enabled with `--cache-file=config.cache' or simply `-C') that saves |
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17 | the results of its tests to speed up reconfiguring. (Caching is |
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18 | disabled by default to prevent problems with accidental use of stale |
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19 | cache files.) |
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20 | |
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21 | If you need to do unusual things to compile the package, please try |
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22 | to figure out how `configure' could check whether to do them, and mail |
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23 | diffs or instructions to the address given in the `README' so they can |
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24 | be considered for the next release. If you are using the cache, and at |
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25 | some point `config.cache' contains results you don't want to keep, you |
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26 | may remove or edit it. |
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27 | |
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28 | The file `configure.ac' (or `configure.in') is used to create |
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29 | `configure' by a program called `autoconf'. You only need |
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30 | `configure.ac' if you want to change it or regenerate `configure' using |
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31 | a newer version of `autoconf'. |
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32 | |
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33 | The simplest way to compile this package is: |
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34 | |
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35 | 1. `cd' to the directory containing the package's source code and type |
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36 | `./configure' to configure the package for your system. If you're |
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37 | using `csh' on an old version of System V, you might need to type |
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38 | `sh ./configure' instead to prevent `csh' from trying to execute |
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39 | `configure' itself. |
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40 | |
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41 | Running `configure' takes awhile. While running, it prints some |
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42 | messages telling which features it is checking for. |
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43 | |
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44 | 2. Type `make' to compile the package. |
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45 | |
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46 | 3. Optionally, type `make check' to run any self-tests that come with |
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47 | the package. |
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48 | |
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49 | 4. Type `make install' to install the programs and any data files and |
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50 | documentation. |
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51 | |
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52 | 5. You can remove the program binaries and object files from the |
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53 | source code directory by typing `make clean'. To also remove the |
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54 | files that `configure' created (so you can compile the package for |
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55 | a different kind of computer), type `make distclean'. There is |
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56 | also a `make maintainer-clean' target, but that is intended mainly |
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57 | for the package's developers. If you use it, you may have to get |
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58 | all sorts of other programs in order to regenerate files that came |
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59 | with the distribution. |
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60 | |
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61 | Compilers and Options |
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62 | ===================== |
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63 | |
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64 | Some systems require unusual options for compilation or linking that |
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65 | the `configure' script does not know about. Run `./configure --help' |
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66 | for details on some of the pertinent environment variables. |
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67 | |
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68 | You can give `configure' initial values for variables by setting |
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69 | them in the environment. You can do that on the command line like this: |
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70 | |
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71 | ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix |
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72 | |
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73 | *Note Environment Variables::, for more details. |
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74 | |
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75 | Compiling For Multiple Architectures |
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76 | ==================================== |
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77 | |
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78 | You can compile the package for more than one kind of computer at the |
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79 | same time, by placing the object files for each architecture in their |
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80 | own directory. To do this, you must use a version of `make' that |
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81 | supports the `VPATH' variable, such as GNU `make'. `cd' to the |
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82 | directory where you want the object files and executables to go and run |
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83 | the `configure' script. `configure' automatically checks for the |
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84 | source code in the directory that `configure' is in and in `..'. |
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85 | |
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86 | If you have to use a `make' that does not support the `VPATH' |
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87 | variable, you have to compile the package for one architecture at a time |
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88 | in the source code directory. After you have installed the package for |
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89 | one architecture, use `make distclean' before reconfiguring for another |
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90 | architecture. |
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91 | |
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92 | Installation Names |
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93 | ================== |
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94 | |
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95 | By default, `make install' will install the package's files in |
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96 | `/usr/local/bin', `/usr/local/man', etc. You can specify an |
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97 | installation prefix other than `/usr/local' by giving `configure' the |
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98 | option `--prefix=PATH'. |
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99 | |
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100 | You can specify separate installation prefixes for |
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101 | architecture-specific files and architecture-independent files. If you |
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102 | give `configure' the option `--exec-prefix=PATH', the package will use |
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103 | PATH as the prefix for installing programs and libraries. |
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104 | Documentation and other data files will still use the regular prefix. |
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105 | |
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106 | In addition, if you use an unusual directory layout you can give |
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107 | options like `--bindir=PATH' to specify different values for particular |
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108 | kinds of files. Run `configure --help' for a list of the directories |
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109 | you can set and what kinds of files go in them. |
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110 | |
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111 | If the package supports it, you can cause programs to be installed |
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112 | with an extra prefix or suffix on their names by giving `configure' the |
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113 | option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'. |
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114 | |
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115 | Optional Features |
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116 | ================= |
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117 | |
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118 | Some packages pay attention to `--enable-FEATURE' options to |
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119 | `configure', where FEATURE indicates an optional part of the package. |
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120 | They may also pay attention to `--with-PACKAGE' options, where PACKAGE |
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121 | is something like `gnu-as' or `x' (for the X Window System). The |
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122 | `README' should mention any `--enable-' and `--with-' options that the |
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123 | package recognizes. |
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124 | |
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125 | For packages that use the X Window System, `configure' can usually |
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126 | find the X include and library files automatically, but if it doesn't, |
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127 | you can use the `configure' options `--x-includes=DIR' and |
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128 | `--x-libraries=DIR' to specify their locations. |
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129 | |
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130 | Specifying the System Type |
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131 | ========================== |
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132 | |
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133 | There may be some features `configure' cannot figure out |
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134 | automatically, but needs to determine by the type of host the package |
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135 | will run on. Usually `configure' can figure that out, but if it prints |
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136 | a message saying it cannot guess the host type, give it the |
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137 | `--build=TYPE' option. TYPE can either be a short name for the system |
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138 | type, such as `sun4', or a canonical name which has the form: |
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139 | |
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140 | CPU-COMPANY-SYSTEM |
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141 | |
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142 | where SYSTEM can have one of these forms: |
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143 | |
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144 | OS |
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145 | KERNEL-OS |
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146 | |
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147 | See the file `config.sub' for the possible values of each field. If |
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148 | `config.sub' isn't included in this package, then this package doesn't |
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149 | need to know the host type. |
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150 | |
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151 | If you are _building_ compiler tools for cross-compiling, you should |
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152 | use the `--target=TYPE' option to select the type of system they will |
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153 | produce code for. |
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154 | |
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155 | If you want to _use_ a cross compiler, that generates code for a |
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156 | platform different from the build platform, you should specify the host |
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157 | platform (i.e., that on which the generated programs will eventually be |
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158 | run) with `--host=TYPE'. In this case, you should also specify the |
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159 | build platform with `--build=TYPE', because, in this case, it may not |
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160 | be possible to guess the build platform (it sometimes involves |
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161 | compiling and running simple test programs, and this can't be done if |
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162 | the compiler is a cross compiler). |
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163 | |
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164 | Sharing Defaults |
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165 | ================ |
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166 | |
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167 | If you want to set default values for `configure' scripts to share, |
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168 | you can create a site shell script called `config.site' that gives |
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169 | default values for variables like `CC', `cache_file', and `prefix'. |
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170 | `configure' looks for `PREFIX/share/config.site' if it exists, then |
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171 | `PREFIX/etc/config.site' if it exists. Or, you can set the |
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172 | `CONFIG_SITE' environment variable to the location of the site script. |
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173 | A warning: not all `configure' scripts look for a site script. |
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174 | |
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175 | Environment Variables |
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176 | ===================== |
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177 | |
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178 | Variables not defined in a site shell script can be set in the |
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179 | environment passed to configure. However, some packages may run |
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180 | configure again during the build, and the customized values of these |
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181 | variables may be lost. In order to avoid this problem, you should set |
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182 | them in the `configure' command line, using `VAR=value'. For example: |
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183 | |
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184 | ./configure CC=/usr/local2/bin/gcc |
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185 | |
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186 | will cause the specified gcc to be used as the C compiler (unless it is |
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187 | overridden in the site shell script). |
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188 | |
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189 | `configure' Invocation |
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190 | ====================== |
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191 | |
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192 | `configure' recognizes the following options to control how it |
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193 | operates. |
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194 | |
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195 | `--help' |
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196 | `-h' |
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197 | Print a summary of the options to `configure', and exit. |
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198 | |
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199 | `--version' |
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200 | `-V' |
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201 | Print the version of Autoconf used to generate the `configure' |
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202 | script, and exit. |
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203 | |
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204 | `--cache-file=FILE' |
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205 | Enable the cache: use and save the results of the tests in FILE, |
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206 | traditionally `config.cache'. FILE defaults to `/dev/null' to |
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207 | disable caching. |
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208 | |
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209 | `--config-cache' |
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210 | `-C' |
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211 | Alias for `--cache-file=config.cache'. |
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212 | |
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213 | `--quiet' |
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214 | `--silent' |
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215 | `-q' |
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216 | Do not print messages saying which checks are being made. To |
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217 | suppress all normal output, redirect it to `/dev/null' (any error |
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218 | messages will still be shown). |
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219 | |
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220 | `--srcdir=DIR' |
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221 | Look for the package's source code in directory DIR. Usually |
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222 | `configure' can determine that directory automatically. |
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223 | |
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224 | `configure' also accepts some other, not widely useful, options. Run |
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225 | `configure --help' for more details. |
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226 | |
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