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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 therefo-
re covered by this License.
Section 6 states terms for distribution of such
executables.
When a "work that uses the Library" uses mate-
rial 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 para-
meters, 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 con-
taining 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 con-
taining 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 engi-
neering for debugging 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 Licen-
se. You must supply a copy of this License. If the
work during execution displays copyright noti-
ces, 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
88
for the Library including whatever changes
were used in the work (which must be distribu-
ted 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 executa-
ble containing the modified Library. (It is
understood that the user who changes the con-
tents 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 pro-
perly 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 reprodu-
cing the executable from it. However, as a spe-
cial exception, the materials to be distributed
need not include anything that is normally dis-
tributed (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 contradicts
the license restrictions of other proprietary
libraries that do not normally accompany the
operating system. Such a contradiction means
you cannot use both them and the Library toge-
ther 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 sin-
gle library together with other library facilities
not covered by this License, and distribute such
a combined library, provided that the separate
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