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Each subdirectory in a distribution that contains something to be
compiled or installed should come with a file `Makefile.in', from
configure will create a `Makefile' in that directory.
To create a `Makefile',
configure performs a simple variable
substitution, replacing occurrences of `@variable@' in
`Makefile.in' with the value that
configure has determined
for that variable. Variables that are substituted into output files in
this way are called output variables. They are ordinary shell
variables that are set in
configure. To make
substitute a particular variable into the output files, the macro
AC_SUBST must be called with that variable name as an argument.
Any occurrences of `@variable@' for other variables are
left unchanged. See section 7.2 Setting Output Variables, for more information
on creating output variables with
A software package that uses a
configure script should be
distributed with a file `Makefile.in', but no `Makefile'; that
way, the user has to properly configure the package for the local system
before compiling it.
See section `Makefile Conventions' in The GNU Coding Standards, for more information on what to put in `Makefile's.
4.7.1 Preset Output Variables Output variables that are always set 4.7.2 Installation Directory Variables Other preset output variables 4.7.3 Build Directories Supporting multiple concurrent compiles 4.7.4 Automatic Remaking Makefile rules for configuring