PUNC User's Guide

Version 0.1

Table of Contents
  1. Overview
  2. Information and Resources
  3. Obtaining PUNC
  4. Frequently Asked Questions
  5. Installation Instructions
  6. Author Information
  7. Copyright and Terms of Use
  8. GNU GPL
NOTE: This documentation provides information about installation, configuration, and general usage of the PUNC libraries. Information about the programming interface provided by the PUNC software can be found in the Programmer's Guide.



Overview

PUNC (Portable Understructure for Numerical Computing) is a small standard collection of software libraries for numerical computing. The PUNC collection includes reference implementations of the standard (dense matrix) linear algebra tools BLAS and LAPACK, and also includes some newer (sparse matrix) linear algebra tools ARPACK, SuperLU, CgCode, and PMG. PUNC also provides some additional basic infrastructure such as the standard F2C header and corresponding library (libF2C), to support the use of F2C'd FORTRAN codes, and some other standard tools used to build numerical simulation software, such as the HDF5 library. While most of the libraries included in PUNC are completely stand-alone, and are the reference implementations developed by the individual library authors, PUNC also provides some Object-oriented C wrappers (written by the FETK developers) for use with Object-oriented C/C++ codes such as FETK . This is accomplished by building PUNC on top of FETK 's MALOC library.

PUNC installs it self minimally, in that if it can find a vendor-supplied version of one of its libraries, it does not build that particular library (unless the installer overrides the configuration and forces PUNC to build a particular library that already exists on the platform). At the end of the PUNC installation, you have a reference collection of the standard numerical software libraries listed above, formed from a combination of any vendor or hand-tuned libraries it found on your platform, together with any additional libraries that were built by PUNC during installation.

PUNC is a class library written in Clean OO C. "Clean" refers to the fact that the language is both legal C++ and legal ANSI/ISO/Standard C, and can be compiled with any standard C or C++ compiler. "OO" refers to the programming style employed -- object-oriented. An Clean OO C implementation consists of a set of "Objects" (Clean C structs) which are operated on by a collection of "methods" (Clean C subroutines) which always have a pointer to the Object as their first argument. This special argument is always written as "thee", analogous to the implicit "this" pointer in C++. (An Clean OO C implementation can be turned into a C++ implementation with a simple AWK/SED or Perl Script.) As a result of this Clean OO C implementation, PUNC can be used as a set of C++-like class libraries, it can be safely software engineered into other large software packages, and it can be built on just about any UNIX-like platform with either a C or a C++ compiler, including e.g. Linux, IRIX, and Win32. To use some of the graphics and parallel computing features, your platform must also have some form of standard INET sockets (WINSOCK will work). PUNC is easily buildable from source on any UNIX-like system, and uses a GNU autoconf build environment.



Information and Resources

Detailed information about PUNC can be found in the User's Guide and Programmers's Guide.

While PUNC is itself a self-contained software package, it is one of several components of FETK (the Finite Element ToolKit). FETK consists of the following components written in Clean OO C:
  • MALOC - Minimal Abstraction Layer for Object-oriented C programs.
  • PUNC - Portable Understructure for Numerical Computing.
  • GAMer - Geometry-preserving Adaptive MeshER (uses MALOC).
  • SG - Socket Graphics mesh display tool (uses MALOC).
  • MC - Manifold Code finite element package (uses MALOC and PUNC).
  • MCX - MC eXtension libraries (uses MALOC, PUNC, and MC).


MALOC is self-contained, and requires only an ANSI-C compiler on a UNIX or Win32 platform. PUNC, GAMer, SG, and MC are also self-contained, but rely on MALOC having been previously installed on the platform. Additional features of MC are enabled if PUNC is available, but PUNC is not required to build MC. The MC eXtension libraries MCX are constructed on top of MALOC and MC, and in order install and use MCX one must first correctly configure and install both MALOC and MC. MCX is made up of a number of individual libraries developed by members of our group, or contributed by one of a number of colleagues. More information about FETK can be found on the FETK website:



Obtaining PUNC

PUNC is copyrighted, but is redistributable in source and binary form under the following license. The PUNC source can be downloaded from the FETK Download Page.

PUNC uses the low-level FETK abstraction library MALOC, which must be installed before installing PUNC.



Frequently Asked Questions

What is PUNC and what does PUNC stand for?

See the Overview.

How to I obtain a copy of the PUNC binaries and/or source code?

See the Obtaining PUNC section.

I managed to get a copy of "punc-VERSION.[i386|src|tar].[rpm|gz]"; how do I now install PUNC?

See the Installation Instructions.

You gave me a "patch.gz" file to fix a bug in PUNC; how do I apply the patch?

To apply patches to upgrade PUNC to a new version, you first obtain the patch from me or my webpage as a single file with a name like "patch.gz". You apply the patch after you have unpacked the punc-VERSION.tar.gz file as described in the installation instructions. To apply the patch, cd into the directory containing the root PUNC directory (called "punc" after unpacking punc-VERSION.tar.gz) and execute the "patch" program as follows (the patch program exists on most UNIX machines):
  • gzip -cd patch.gz | patch -p0


Patch files are simply the output from a recursive "diff" that are used to represent all differences between two directory trees. For example, to create a patch representing the changes from version 1.0 of PUNC (in directory punc_1.0 for example) to version 1.1 of PUNC (e.g. in directory punc_1.1), I would normally type the following:
  • diff -r -u -N punc_1.0 punc_1.1 > patch1
  • gzip -v patch1
which would produce the gzipped patch file "patch1.gz". If you had previously installed version 1.0 of PUNC but would like to upgrade to version 1.1 of PUNC, you could just download the file "patch1.gz" and apply the changes using the program "patch" as above, rather than downloading and reinstalling the entire version 1.1 of PUNC.

I really don't know what I'm doing; how to I get more documentation for PUNC?

The User's Guide and the Programmers's Guide contain all of the PUNC documentation.

Why did you develop PUNC? Can't you just use BLAS and possibly LAPACK?

Yes, we definitely need to use LAPACK (built on the BLAS). However, modern PDE simulation codes involve applying, inverting, or analyzing the spectral properties of very large sparse matrices, so modern sparse matrix libraries that have much of the capabilities of LAPACK must be used. LAPACK was an update to LINPACK (direct methods and factorizations for dense and banded matrices) and EISPACK (methods for computing the eigenpairs of dense and banded matrices). SuperLU and ARPACK can be viewed as providing these same general capabilities (respectively) but for sparse matrices. CgCode and PMG (two choices out of a number that could have been made) provide additional capabilities not in any of the other libraries, namely the iterative solution of large sparse linear systems using CG-type methods and Multilevel methods.

One often needs to use many or most of these tools for the development of numerical PDE simulation software, but it is often quite complex to install all of these packages and to be certain that they are working as designed on the particular platform. PUNC basically provides three things: (1) reference implementations of these libraries to flesh out your computing platform; (2) convenient portable configuration and installation of some or all of the libraries; and (3) additional basic infrastructure for using these libraries together and with other software.

What is in all of these subdirectories? Where exactly is "PUNC"?

PUNC consists of several (class) libraries from which you will call routines to handle your application. You simply link your application to the PUNC static or shared library. The MC package automatically looks for the PUNC libraries as part of its Autoconf configuration process.
                                   punc
                                     |
                         ------------------------
                        /      |     |      |    \ 
                       config doc examples src tools

The src directory has the additional subdirectory structure:
                                   src
                                    |
           -----------------------------------------------------
          /     |      |    |   |       |       |      |     |  \
     aaa_inc aaa_lib base blas lapack arpack superlu cgcode pmg vf2c

Within each library source directory is an additional subdirectory, "punc". The "punc" subdirectory contains public headers for the library, representing the library API; these headers will be installed in the specified header install directory during the install procedure after building PUNC.

The following is a brief description of each subdirectory of the package.
    punc             - The entire PUNC package
    punc/config      - GNU Autoconf scripts and non-unix config files
    punc/doc         - PUNC documentation
    punc/examples    - Complex examples and data files for using PUNC
    punc/src         - PUNC source code (all source and headers)
    punc/src/aaa_inc - Header installation tools
    punc/src/aaa_lib - Library installation tools
    punc/src/*/punc  - The PUNC headers (API)
    punc/src/base    - Source for M. Holst's BASE  (PUNC foundation headers)
    punc/src/pmg     - Source for M. Holst's PMG   (Parallel MultiGrid)
    punc/src/blas    - Source for Reference Implementation of BLAS
    punc/src/lapack  - Source for Reference Implementation of LAPACK
    punc/src/arpack  - Source for Reference Implementation of ARPACK
    punc/src/superlu - Source for Reference Implementation of SuperLU
    punc/src/cgcode  - Source for Reference Implementation of CgCode
    punc/src/vf2c    - Source for Reference Implementation of F2C
    punc/tools       - Some binary tools for use with PUNC


Okay, I seem to have installed PUNC correctly; how do I actually use it now?

Using PUNC is pretty simple; it is a very object-oriented implementation, although it is written in C. It is actually written in an object-oriented way using a subset of ANSI/Standard C, sometimes referred to as Clean OO C. Clean C refers to the overlapping subset of ANSI/Standard C and C++, so you can compile the code as a legal C++ or ANSI/Standard C code. Using the code consists of constructing objects (represented by C structs) and manipulating these objects using appropriate methods (represented by C functions which follow a certain object-oriented prototype convention).

What is the class hierarchy? How are the various libraries related?

Detailed information on the class relationships can be found in the Programmers's Guide. The following directed graph shows the class library dependencies. (This tends to evolve as PUNC is developed.)
   ANSI-C ======> base 
          ======> vf2c
          ======> superlu

   F2C+ANSI-C ==> blas
              ==> lapack
              ==> arpack
              ==> cgcode
              ==> pmg

Wait! I have a bunch of other questions, such as:
  • What in tarnation is "Clean OO C"?
  • Why is PUNC written in Clean OO C rather than C++ or Objective-C?
  • Why is PUNC written on top of this other package with a weird name (MALOC)?
  • I want to extend PUNC and/or MALOC in some way; what is the "Coding Style"?
  • I wrote a cool extension; how do I get it included in PUNC and/or MALOC?
These and other related questions are addressed in the MALOC FAQ, which is distributed as the README file in the MALOC source distribution.



Installation Instructions

Available distribution formats

PUNC is distributed in both binary format (as a binary RPM file punc-VERSION.i386.rpm for i386-based versions of Linux) and in source format (as a source RPM file punc-VERSION.src.rpm and as a gzipped tar file "punc-VERSION.tar.gz").

Installation using the binary RPM file

The following rpm command will install all of the PUNC headers and libraries into /usr/local/include and /usr/local/lib, and will install the PUNC documentation into /usr/share/doc/packages/punc:
    rpm -Uvh punc-VERSION.i386.rpm

Installation and rebuilding from sources using the source RPM file

The following rpm command will unpack the source rpm file "punc-VERSON.src.rpm" into the PUNC gzipped tar file containing the sources called "punc-VERSION.tar.tar.gz" and into a small RPM spec file called "punc-VERSON.spec":
    rpm -Uvh punc-VERSION.src.rpm
The sources can then be unpacked and built using the directions for the gzipped tar file below. Alternatively, the following rpm command will do these steps for you:
    rpm -bp punc-VERSION.spec

Rebuilding binary and source RPM files from the gzipped tar file

The PUNC sources contain the RPM spec file "punc-VERSON.spec" in the root source directory; as a result, rebuilding the RPM files from sources can be done using the rpm command:
    rpm -ta punc-VERSION.tar.gz
The result will be the corresponding source and binary rpm files, named "punc-VERSON.src.rpm" and "punc-VERSION.i386.rpm". Normally, these files are written to /usr/src/redhat/SRPMS and /usr/src/redhat/RPMS respectively, but you must be logged in as root for these to work. The destination directories can be overriden using arguments to the rpm program (see the rpm manpage).

Installation and building from sources using the gzipped tar file

The following command will unpack PUNC into a number of subdirectories and files on any UNIX machine (and on any WinNT machine with the GNU-Win32 tools gzip and tar).
    gzip -dc punc-VERSION.tar.gz | tar xvf -

PUNC is essentially a portable low-level numerical software library which was assembled to support the development of MC (Manifold Code), a multilevel adaptive finite element "kernel". MC is designed to be easily extended through the use of extension packages which are constructed on top of MC, which itself is written on top of PUNC and MALOC. The installation instructions PUNC, MC, and related software are identical to the instructions below for PUNC.

Building the package using the GNU "configure" shell script and "make"

The "configure" shell script in the "punc" directory (the toplevel directory created when you unpacked the PUNC tar.gz file) will build the entire package. This is a standard GNU autoconf-generated configuration script. For a list of the possible configuration options, type:
    ./configure --help

You should be able to build PUNC by simply typing:
    ./configure
    make
    make install

However, it is often advantageous to keep the original source directory pristine; the configure script can actually be run outside the source tree, which will keep all files created by the build outside the source tree. (This idea is related to the section below describing how to build binaries for multiple architectures at the same time using the same source tree, and requires that your version of make has the VPATH facility, such as GNU make.) For example, I build PUNC in a separate directory from the source tree as follows:
    gzip -dc punc-VERSION.tar.gz | tar xvf -
    mkdir punc_build
    cd punc_build
    ../punc/configure
    make
    make install

Building binaries for multiple architectures in the same source directory

If you have a version of "make" that supports the VPATH facility (such as any recent version of GNU make), then you can build the package for multiple architectures in the same source directory (in fact, you can do the compiles at the same time without collisions). This is very useful if you have your home directory on an NFS volume that you share among multiple architectures, such as SGI, Linux, etc. To build PUNC for all the systems at the same time, you simply make an additional subdirectory in the main PUNC directory for each architecture, copy "configure" into it, "cd" into the subdirectory, and then install as above. For example, on a linux machine you would do the following:
    mkdir linux
    cp configure linux/.
    cd linux
    ./configure
    make
    make install
If you mount the same NFS home directory on for example an OpenStep box, you could at the same time do the following:
    mkdir next
    cp configure next/.
    cd next
    ./configure
    make
    make install
Again, both builds can actually be done outside the source tree rather than in a subdirectory of the source tree, as described in the previous section.

Building shared libraries rather than static libraries

(MIKE: give an overview of libtool.)

Rebuilding the configure script and the Makefile.in files

If for some reason you actually need to rebuild the configure script or the Makefile.in files using the GNU autoconf suite, you should read the block of documentation at the top of the configure.in file. The commentary I put there explains exactly how the GNU autoconf suite must be used and in what order, and exactly what files are produced at each step of the process. A script called "bootstrap" which automates this process is located in the config subdirectory of the PUNC source tree.

Platform-specific information

Below is some platform-specific build/usage information for PUNC.
  • Linux (Source: M. Holst, UCSD)

    Things should work as described above.

  • FreeBSD/NetBSD/OpenBSD (Source: M. Holst, UCSD)

    Things should work as described above.

  • OpenStep (Source: M. Holst, UCSD)

    Things should just work, but you may have to set the CC environment variable as follows before typing ./configure:
        export CC="/bin/cc"
    
    or you might need to use:
        export CC="/bin/cc -ObjC"
    

  • IRIX (Source: M. Holst, UCSD)

    If you are on a 64-bit IRIX box such as an Onyx, Octane, or Origin, set the CC environment variable as follows before typing ./configure:
        export CC="/bin/cc -64"
    
    If you are on a 32-bit IRIX box such as an O2 or Indy, set the CC environment variable as follows before typing ./configure:
        export CC="/bin/cc -32"
    

  • Win32 (Source: M. Holst, UCSD)

    Unless you have the Cygwin environment, you need to use one of the included project file collections for one of the commercially available ANSI C or C++ compilers for the Win32 environment.

What you end up with

Once the build completes via the "configure;make;make install" procedure above with no errors, the PUNC library (libpunc.a and/or libpunc.so) is installed into the specified installation directory. You can also build some useful tools that employ the PUNC library by cd-ing into the "tools" subdirectory and repeating the "configure;make;make install" procedure.

Using PUNC on a parallel computer

PUNC provides abstractions to both INET sockets and MPI for communication support in parallel computing software; this is done through the use of the underlying MALOC library. See the MALOC documentation for more details.

Getting PUNC to find your installation of MPI

If your installation of MPI is located in an unusual directory, then the configuration script may have trouble finding the MPI library (libmpi.a) or the MPI header file (mpi.h). Again, the configure script prints out the state of affairs quite clearly as to whether it found the library and the header. If you have MPI and configure is not finding it, then here are several possible solutions, each of which usually works. They are listed in preferred order (i.e. you should try Solution 1 first, and if that doesn't work try Solution 2, and so on).
  • Solution 1:

    Have your system administrator install MPI in a proper system directory so that PUNC (and other AUTOCONF-based codes) can find it!

  • Solution 2:
    1. Find the location of libmpi.a and mpi.h on your system, either by asking your sysadmin, poking around yourself, or (if you have it) using the "locate" utility:
          locate mpi.h
          locate libmpi.a
          locate libmpich.a
      
      On my Redhat6.2 Linux box, the following output is produced:
          bash:~% locate mpi.h
          /usr/share/mpi/include/mpi.h
          bash:~% locate libmpi.a
          bash:~% locate libmpich.a
          /usr/share/mpi/lib/libmpich.a
      
      Therefore the MPI header is installed as:
          /usr/share/mpi/include/mpi.h
      
      and the MPI library is installed as:
          /usr/share/mpi/lib/libmpich.a
      
    2. Before running the configure script, preset the FETK_MPI_INCLUDE and FETK_MPI_LIBRARY environment variables to point to the directories containing mpi.h and libmpi.a (or libmpich.a). Under bash, using the results from the example above, I would do this as follows:
          export FETK_MPI_INCLUDE=/usr/share/mpi/include
          export FETK_MPI_LIBRARY=/usr/share/mpi/lib
          ./configure --enable-mpi
          make clean; make; make install
      
      The configure script should now report that it successfully found the library and header and thus enabled MPI, and then PUNC should compile without error.




Author Information

PUNC (Portable Understructure for Numerical Computing) was conceived, designed, and implemented over several years by Michael Holst, beginning with an initial implementation in 1994. Various colleagues have contributed ideas and/or code to PUNC (see the credits list below).
    PUNC (Portable Understructure for Numerical Computing)
    Copyright (C) 1994-2010

    Michael Holst               TELE:  (858) 534-4899
    Department of Mathematics   FAX:   (858) 534-5273
    UC San Diego, AP&M 5739     EMAIL: mholst@ccom.ucsd.edu
    La Jolla, CA 92093 USA      WEB:   http://ccom.ucsd.edu/~mholst
PUNC was designed to be a portable collection of standard numerical libraries for use in the development of MC (Manifold Code), an adaptive multilevel finite element package also developed by Michael Holst. PUNC was developed almost entirely on a home-grown 90Mhz Pentium PC running various flavors of Linux and [Free|Net|Open]BSD, using primarily GNU, BSD, and other free software development tools. Most of the development occurred during the hours of 10pm to 2am on a daily basis for several years, under heavy influence of Starbuck's coffee, with helpful advice provided by Mac and Mochi (two cats knowledgable in socket programming and numerical analysis).

PUNC was released under the GNU GPL (GNU General Public License) beginning with the initial implementation in 1994, and continues to be released under this license. What this means is that like all GNU softare, PUNC is freely redistributable in source code form following the rules outlined in the text of the GNU GPL. You should have received a copy of the GNU GPL with this distribution of PUNC; a copy can be found here. If you did not receive a copy of the GNU GPL, please write to me and also write to: The Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

Credits

Below is a credits list for the people that have contributed to PUNC in one way or another. The fields below follow the credits file format used in the Linux kernel CREDITS file to allow for easy manipulation via shell scripts. The fields are as follows:
          N: name of contributor
          E: email address
          W: web address
          P: PGP key ID and fingerprint
          D: description of primary contributions
          S: snail-mail address

N: Michael Holst
E: mholst@ccom.ucsd.edu
W: http://ccom.ucsd.edu/~mholst
P: 1024/0xB5212DCD
D: punc/*                      -- The package structure
D: punc/acconfig.h             -- The platform abstraction information
D: punc/configure.in           -- The GNU autoconf/automake structure
D: punc/config/*               -- The GNU autoconf/automake shell scripts
D: punc/doc/*                  -- The package documentation
D: punc/examples/*             -- The package examples
D: punc/src/aaa_inc/*          -- Library header build structure
D: punc/src/aaa_lib/*          -- Static and shared library build structure
D: punc/src/base/*             -- M. Holst's PUNC Foundation headers
D: punc/src/pmg/*              -- M. Holst's PMG
D: punc/src/blas/*             -- Reference implementation of BLAS
D: punc/src/lapack/*           -- Reference implementation of LAPACK
D: punc/src/arpack/*           -- Reference implementation of ARPACK
D: punc/src/superlu/*          -- Reference implementation of SuperLU
D: punc/src/cgcode/*           -- Reference implementation of CgCode
D: punc/src/vf2c/*             -- Reference implementation of F2C
D: punc/tools/*                -- Tools built on the libraries
S: Department of Mathematics
S: UC San Diego, AP&M 5739
S: La Jolla, CA 92093 USA

N: Steve Bond
E: bond@ccom.ucsd.edu
D: punc/punc.spec             -- RPM support (for building src/binary RPMs)
S: Department of Mathematics
S: UC San Diego
S: La Jolla, CA 92093 USA

Contacting the Author

If you have questions or comments about PUNC, please feel free to contact me at mholst@ccom.ucsd.edu.



Copyright and Terms of Use Please acknowledge your use of PUNC and FETK by citing:
  • M. Holst, Adaptive numerical treatment of elliptic systems on manifolds. Advances in Computational Mathematics, 15 (2001), pp. 139-191.

This version of PUNC is distributed under the following guidelines:
  • PUNC (Portable Understructore for Numerical Computing)
    Copyright (C) 1994-2010 Michael Holst

    This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.



GNU GPL

The GPL (GNU General Public License) below is copyrighted by the Free Software Foundation. However, the instance of software that it refers to, my package in this case, is copyrighted by myself as the author of the package. Any additional software that I distribute with my software is copyrighted by the authors of those pieces of software (see the individual source files for author information). ---Michael Holst
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    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)

These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the Program,
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 Program, 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 Program.

In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.

  3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

    a) 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; or,

    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)

The source code for a work means the preferred form of the work for
making modifications to it.  For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable.  However, as a
special exception, the source code distributed 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.

If distribution of executable or 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 counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.

  4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

  5. You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.

  8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

			    NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

		     END OF TERMS AND CONDITIONS

	    How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    (one line to give the program's name and a brief idea of what it does.)
    Copyright (C) 19yy  < name of author >

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) 19yy name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.

  < signature of Ty Coon >, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library.  If this is what you want to do, use the GNU Library General
Public License instead of this License.