Is this intentionally left here? If so and you're modifying a GPL work you might want to read this section from the license text:
>Conveying Modified Source Versions.

>You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:

> a) The work must carry prominent notices stating that you modified
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> b) The work must carry prominent notices stating that it is
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> c) You must license the entire work, as a whole, under this
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    License will therefore apply, along with any applicable section 7
    additional terms, to the whole of the work, and all its parts,
    regardless of how they are packaged. This License gives no
    permission to license the work in any other way, but it does not
    invalidate such permission if you have separately received it.

> d) If the work has interactive user interfaces, each must display
    Appropriate Legal Notices; however, if the Program has interactive
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    work need not make them do so.

> A compilation of a covered work with other separate and independent
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and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.