d) If a facility in the modified Library refers to a function or a table of data to be supplied by an application program that
uses the facility, other than as an argument passed when the facility is invoked, then you must make a good faith effort
to ensure that, in the event an application does not supply such function or
table, the facility still operates, and performs whatever part of its purpose remains meaningful.
(For example, a function in a library to compute square roots has a purpose that is entirely well-defined independent of
the application. Therefore, Subsection 2d requires that any application-supplied function or table used by this function
must be optional: if the application does not supply it, the square root function must still compute square roots.)
These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the
Library, and can be reasonably considered independent and separate works in themselves, then this License, and its terms,
do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as
part of a whole which is a work based on the Library, the distribution of the whole must be on the terms of this License,
whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote
it.
Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the
intent is to exercise the right to control the distribution of derivative or collective works based on the Library.
In addition, mere aggregation of another work not based on the Library with the Library (or with a work based on the
Library) on a volume of a storage or distribution medium does not bring the other work under the scope of this License.
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 program 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 customarily 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 compelled 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 therefore 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 accessors, and small macros and small
inline functions (ten lines or less in length), then the use of the object file 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.)
LICENSE INFORMATION
365