(autocf21.info.gz) Default Prefix
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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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