<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</userinput>

scons: *** NameError `name 'MISSING' is not defined' trying to evaluate `$MISSING'
File "/home/my/project/SConstruct", line 3, in &lt;module&gt;
</screen>
