<para>
One difficulty that comes up from time to time is running out of space
-in <filename>/tmp</filename>. (It is impossible for the configuration stuff to
+in <literal>TMPDIR</literal>. (It is impossible for the configuration stuff to
compensate for the vagaries of different sysadmin approaches to temp
space.)
<IndexTerm><Primary>tmp, running out of space in</Primary></IndexTerm>