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Appendix
31
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
accessories, 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.)
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.
6. As an exception to the Sections above, you
may also combine or link a “work that uses the
Library” with the Library to produce a work
containing portions of the Library, and
distribute that work under terms of your
choice, provided that the terms permit
modification of the work for the customer’s
own use and reverse engineering for debug-
ging such modifications.
You must give prominent notice with each copy
of the work that the Library is used in it and
that the Library and its use are covered by this
License. You must supply a copy of this License.
If the work during execution displays copyright
notices, you must include the copyright notice
for the Library among them, as well as a
reference directing the user to the copy of this
License. Also, you must do one of these things:
a) Accompany the work with the complete
corresponding machine-readable source code
for the Library including whatever changes
were used in the work (which must be
distributed under Sections 1 and 2 above); and,
if the work is an executable linked with the
Library, with the complete machine-readable
“work that uses the Library", as object code
and/or source code, so that the user can modify
the Library and then relink to produce a
modified executable containing the modified
Library. (It is understood that the user who
changes the contents of definitions files in the
Library will not necessarily be able to recompile
the application to use the modified definitions.)
b) Use a suitable shared library mechanism for
linking with the Library. A suitable mechanism
is one that (1) uses at run time a copy of the
library already present on the user’s computer
system, rather than copying library functions
into the executable, and (2) will operate
properly with a modified version of the library,
if the user installs one, as long as the modified
version is interface-compatible with the version
that the work was made with.
c) Accompany the work with a written offer,
valid for at least three years, to give the same
user the materials specified in Subsection 6a,
above, for a charge no more than the cost of
performing this distribution.
d) If distribution of the work is made by
offering access to copy from a designated
place, offer equivalent access to copy the above
specified materials from the same place.
e) Verify that the user has already received a
copy of these materials or that you have already
sent this user a copy.
For an executable, the required form of the
“work that uses the Library” must include any
data and utility programs needed for reproduc-
ing the executable from it. However, as a
special exception, the materials to be distrib-
uted need not include anything that is normally
distributed (in either source or binary form)
with the major components (compiler, kernel,
and so on) of the operating system on which
the executable runs, unless that component
itself accompanies the executable.
It may happen that this requirement contra-
dicts the license restrictions of other propri-
etary libraries that do not normally accompany
the operating system. Such a contradiction
means you cannot use both them and the
Library together in an executable that you
distribute.
7. You may place library facilities that are a
work based on the Library side-by-side in a