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Variables used when building a program

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.


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