(automake-1.16.info)Standard Configuration Variables

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2.2.4 Standard Configuration Variables
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The GNU Coding Standards also define a set of standard configuration
variables used during the build.  Here are some:

‘CC’
     C compiler command
‘CFLAGS’
     C compiler flags
‘CXX’
     C++ compiler command
‘CXXFLAGS’
     C++ compiler flags
‘LDFLAGS’
     linker flags
‘CPPFLAGS’
     C/C++ preprocessor flags
...

   ‘configure’ usually does a good job at setting appropriate values for
these variables, but there are cases where you may want to override
them.  For instance you may have several versions of a compiler
installed and would like to use another one, you may have header files
installed outside the default search path of the compiler, or even
libraries out of the way of the linker.

   Here is how one would call ‘configure’ to force it to use ‘gcc-3’ as
C compiler, use header files from ‘~/usr/include’ when compiling, and
libraries from ‘~/usr/lib’ when linking.

     ~/amhello-1.0 % ./configure --prefix ~/usr CC=gcc-3 \
     CPPFLAGS=-I$HOME/usr/include LDFLAGS=-L$HOME/usr/lib

   Again, a full list of these variables appears in the output of
‘./configure --help’.