(autoconf.info)Default Prefix

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3.6 Default Prefix
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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'.