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(automake.info)Program variables

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Variables used when building a program
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   Occasionally it is useful to know which `Makefile' variables
Automake uses for compilations; for instance you might need to do your
own compilation in some special cases.

   Some variables are inherited from Autoconf; these are `CC',
`CFLAGS', `CPPFLAGS', `DEFS', `LDFLAGS', and `LIBS'.

   There are some additional variables which Automake itself defines:

`INCLUDES'
     A list of `-I' options.  This can be set in your `Makefile.am' if
     you have special directories you want to look in.  Automake already
     provides some `-I' options automatically.  In particular it
     generates `-I$(srcdir)' and a `-I' pointing to the directory
     holding `config.h' (if you've used `AC_CONFIG_HEADER' or
     `AM_CONFIG_HEADER').

     `INCLUDES' can actually be used for other `cpp' options besides
     `-I'.  For instance, it is sometimes used to pass arbitrary `-D'
     options to the compiler.

`COMPILE'
     This is the command used to actually compile a C source file.  The
     filename is appended to form the complete command line.

`LINK'
     This is the command used to actually link a C program.