<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 COLORS=magenta foo.o</userinput>

scons: *** Invalid value(s) for variable 'COLORS': 'magenta'. Valid values are: blue,green,red,all,none
File "/home/my/project/SConstruct", line 7, in &lt;module&gt;
</screen>
