<screen xmlns="http://www.scons.org/dbxsd/v1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">% <userinput>scons -Q foo.o</userinput>
cc -o foo.o -c -DCONFIG_FILE="/etc/my_config" foo.c
% <userinput>scons -Q CONFIG=/usr/local/etc/other_config foo.o</userinput>
scons: `foo.o' is up to date.
</screen>
