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(kpathsea.info)configure environment

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`configure' environment
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  `configure' uses the value of the following environment variables in
determining your system's characteristics, and substitutes for them in
Makefile's:

`CC'
     The compiler to use: default is `gcc' if it's installed, otherwise
     `cc'.

`CFLAGS'
     Options to give the compiler: default is `-g -O2' for `gcc', `-g'
     otherwise.  `CFLAGS' comes after any other options.  You may need
     to include `-w' here if your compilations commonly have useless
     warnings (e.g., `NULL redefined'), or `configure' may fail to
     detect the presence of header files (it takes the messages on
     standard error to mean the header file doesn't exist).

`CPPFLAGS'
     Options to pass to the compiler preprocessor; this matters most for
     configuration, not the actual source compilation.  The `configure'
     script often does only preprocessing (e.g., to check for the
     existence of #include files), and `CFLAGS' is not used for this.
     You may need to set this to something like
     `-I/usr/local/include/wwwhatever' if you have the libwww library
     installed for hyper-xdvik (see `xdvik/INSTALL').

`DEFS'
     Additional preprocessor options, but not used by `configure'.
     Provided for enabling or disabling program features, as documented
     in the various program-specific installation instructions.  `DEFS'
     comes before any compiler options included by the distribution
     `Makefile's or by `configure'.

`LDFLAGS'
     Additional options to give to the loader.  `LDFLAGS' comes before
     any other linker options.

`LIBS'
     Additional libraries to link with.