bash: Sharing Defaults

 
 10.6 Sharing Defaults
 =====================
 
 If you want to set default values for 'configure' scripts to share, you
 can create a site shell script called 'config.site' that gives default
 values for variables like 'CC', 'cache_file', and 'prefix'.  'configure'
 looks for 'PREFIX/share/config.site' if it exists, then
 'PREFIX/etc/config.site' if it exists.  Or, you can set the
 'CONFIG_SITE' environment variable to the location of the site script.
 A warning: the Bash 'configure' looks for a site script, but not all
 'configure' scripts do.