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 3.6 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 besides
 `/usr/local' by default.  To accomplish that, use the
 `AC_PREFIX_DEFAULT' macro.
 
  -- Macro: AC_PREFIX_DEFAULT (PREFIX)
      Set the default installation prefix to PREFIX instead of
      `/usr/local'.
 
    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
 `AC_PREFIX_PROGRAM'.
 
  -- Macro: AC_PREFIX_PROGRAM (PROGRAM)
      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;
      otherwise leave the prefix specified in `Makefile.in' unchanged.
      For example, if PROGRAM is `gcc' and the `PATH' contains
      `/usr/local/gnu/bin/gcc', set the prefix to `/usr/local/gnu'.
 
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