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Appendix
3. You may opt to apply the terms of the ordinary GNU General Public License instead
of this License to a given copy of the Library. To do this, you must alter all the notices
that refer to this License, so that they refer to the ordinary GNU General Public License,
version 2, instead of to this License. (If a newer version than version 2 of the ordinary
GNU General Public License has appeared, then you can specify that version instead if
you wish.) Do not make any other change in these notices.
Once this change is made in a given copy, it is irreversible for that copy, so the ordinary
GNU General Public License applies to all subsequent copies and derivative works made
from that copy.
This option is useful when you wish to copy part of the code of the Library into a pro-
gram that is not a library.
4. You may copy and distribute the Library (or a portion or derivative of it, under Section
2) in object code or executable form under the terms of Sections 1 and 2 above provided
that you accompany it with the complete corresponding machine-readable source code,
which must be distributed under the terms of Sections 1 and 2 above on a medium cus-
tomarily used for software interchange.
If distribution of object code is made by offering access to copy from a designated place,
then offering equivalent access to copy the source code from the same place satisfies
the requirement to distribute the source code, even though third parties are not com-
pelled to copy the source along with the object code.
5. A program that contains no derivative of any portion of the Library, but is designed
to work with the Library by being compiled or linked with it, is called a "work that uses
the Library". Such a work, in isolation, is not a derivative work of the Library, and there-
fore falls outside the scope of this License.
However, linking a "work that uses the Library" with the Library creates an executable
that is a derivative of the Library (because it contains portions of the Library), rather
than a "work that uses the library". The executable is therefore covered by this License.
Section 6 states terms for distribution of such executables.
When a "work that uses the Library" uses material from a header file that is part of the
Library, the object code for the work may be a derivative work of the Library even
though the source code is not. Whether this is true is especially significant if the work
can be linked without the Library, or if the work is itself a library. The threshold for this
to be true is not precisely defined by law.
If such an object file uses only numerical parameters, data structure layouts and acces-
sors, and small macros and small inline functions (ten lines or less in length), then the
use of the objectfile is unrestricted, regardless of whether it is legally a derivative work.
(Executables containing this object code plus portions of the Library will still fall under
Section 6.)
Otherwise, if the work is a derivative of the Library, you may distribute the object code
for the work under the terms of Section 6.Any executables containing that work also fall
under Section 6,whether or not they are linked directly with the Library itself.
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