(autoconf.info)Default Prefix

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4.13 Default Prefix

By default, `configure' sets the prefix for files it installs to
`/usr/local'.  The user of `configure' can select a different prefix
using the `--prefix' and `--exec-prefix' options.  There are two ways
to change the default: when creating `configure', and when running it.

   Some software packages might want to install in a directory other
than `/usr/local' by default.  To accomplish that, use the

     Set the default installation prefix to PREFIX instead of

   It may be convenient for users to have `configure' guess the
installation prefix from the location of a related program that they
have already installed.  If you wish to do that, you can call

     If the user did not specify an installation prefix (using the
     `--prefix' option), guess a value for it by looking for PROGRAM in
     `PATH', the way the shell does.  If PROGRAM is found, set the
     prefix to the parent of the directory containing PROGRAM, else
     default the prefix as described above (`/usr/local' or
     `AC_PREFIX_DEFAULT').  For example, if PROGRAM is `gcc' and the
     `PATH' contains `/usr/local/gnu/bin/gcc', set the prefix to

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