User manual

Table Of Contents
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.)
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 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 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
114