(autocf21.info.gz) Makefile Substitutions

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 3.3 Substitutions in Makefiles
 ==============================
 
 Each subdirectory in a distribution that contains something to be
 compiled or installed should come with a file `Makefile.in', from which
 `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 `configure' 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.   Setting Output Variables,
 for more information on creating output variables with `AC_SUBST'.
 
    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.
 
     Makefile Conventions (standards)Makefile Conventions, for
 more information on what to put in `Makefile's.
 

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* Preset Output Variables     Output variables that are always set.
* Build Directories           Supporting multiple concurrent compiles.
* Automatic Remaking          Makefile rules for configuring.
 

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