According to the ASF Source Header and Copyright Notice Policy (http://www.apache.org/legal/src-headers.html), all human-readable Apache-developed files that are included within a distribution must include ASL header text. None of the source files for our config tests currently does. These headers need to be added in time for the 4.2.0 release.
Note that since in the config tests, the first line is reserved for the "label" displayed by GNUMakefile.cfg before compiling the test, the headers cannot start on the first line. Instead, it should be fine to append the header to the end of every config test instead.
Since the above mentioned policy applies to releases distributed after November 1, 2006, this task affects trunk only (and not any already published releases or snapshots).