(automake-1.16.info)config.site

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2.2.5 Overriding Default Configuration Setting with ‘config.site’
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When installing several packages using the same setup, it can be
convenient to create a file to capture common settings.  If a file named
‘PREFIX/share/config.site’ exists, ‘configure’ will source it at the
beginning of its execution.

   Recall the command from the previous section:

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

   Assuming we are installing many package in ‘~/usr’, and will always
want to use these definitions of ‘CC’, ‘CPPFLAGS’, and ‘LDFLAGS’, we can
automate this by creating the following ‘~/usr/share/config.site’ file:

     test -z "$CC" && CC=gcc-3
     test -z "$CPPFLAGS" && CPPFLAGS=-I$HOME/usr/include
     test -z "$LDFLAGS" && LDFLAGS=-L$HOME/usr/lib

   Now, any time a ‘configure’ script is using the ‘~/usr’ prefix, it
will execute the above ‘config.site’ and define these three variables.

     ~/amhello-1.0 % ./configure --prefix ~/usr
     configure: loading site script /home/adl/usr/share/config.site
     ...

   Note: Setting Site Defaults, for more
information about this feature.