------------------------------------------------------------------------------
WCSLIB 7.3 and PGSBOX 7.3 INSTALLATION
--------------------------------------

WCSLIB requires an ANSI C compiler with standard ANSI C environment, that is,
a standard C library and header files as defined in Appendix B of Kernigan &
Ritchie, 2nd ed.

If you are running a typical Linux distro and have installed WCSLIB before,
then all you should need to do is

  tar pxvf wcslib-7.3.tar.bz2
  cd wcslib-7.3
  make install

Otherwise, read on.

Installation of WCSLIB is handled by GNU autoconf; GNU make (referred to here
as 'gmake') must be used.  The WCSLIB distribution also includes PGSBOX (refer
to the README file).  To unpack the tar file, type

  bzcat wcslib-7.3.tar.bz2 | tar pvxf -
  cd wcslib-7.3

then if you do not need to specify any configuration options, simply run

  gmake

This will run 'configure' to generate "makedefs" which is included by the top-
level GNUmakefile and those in each subdirectory, and then build 'libwcs.a',
which includes both the C library and Fortran wrappers, and also libpgsbox.a.

(WARNING: The build may fail with gmake 3.79, upgrade to 3.79.1 or later.)

configure tries to determine the location of the PGPLOT and CFITSIO libraries
required by some utilities (wcsware, wcsgrid) and programs in the test suite.
If it fails to find them you can, if you wish, tailor the few variables found
at the start of "makedefs".  Of course you do not need to exercise the test
suite in order to build and install the library - if configure fails to find
anything required for that it will issue an explicit error message.

To build and exercise the test suite use

  gmake check

To install the object libraries and header files, do

  gmake install


TWEAKING THE INSTALLATION DEFAULTS
----------------------------------

By default the library and header files are installed in the lib and include
subdirectories of /usr/local/.  To change this, or any other options, run
configure separately before gmake:

  ./configure --prefix=/some/other/dir
  gmake

Use

  ./configure --help

to list configure's options.  Useful options are

  --with-pgplotinc
  --with-pgplotlib
  --with-cfitsioinc
  --with-cfitsiolib

Which allow additional directories to be added to the library and include
file search path.

Installation of WCSLIB differs a little from most packages in that all
configurable makefile variables are defined in a single file, "makedefs",
which configure generates from "makedefs.in".  If you need to redefine any of
the makefile variables you can modify makedefs, or preferably makedefs.in.
The makefile will automatically detect this and re-run config.status to
re-generate a new makedefs.  configure also creates four header files:

  wcsconfig.h: Contains general purpose preprocessor definitions.  It is
    included by the other wcsconfig header files.

  wcsconfig_f77.h: By common convention the WCSLIB Fortran wrappers have
    been written (in C) using function names in lower case with an
    underscore ("_") suffix.  wcsconfig_f77.h defines a preprocessor macro,
    F77_FUNC(name,NAME), that may redefine these to suit different name
    mangling schemes used by some Fortran compilers.

  wcsconfig_tests.h: Contains C preprocessor definitions for compiling the
    test/demo programs.

  wcsconfig_utils.h: Contains C preprocessor macro definitions for compiling
    the utility programs provided with WCSLIB.

If you do have trouble building the library please send me config.log.


The INSTALL file provided with GNU autoconf 2.53 is appended without change.


Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id: INSTALL,v 7.3 2020/06/03 03:37:03 mcalabre Exp $

==============================================================================

Copyright 1994, 1995, 1996, 1999, 2000, 2001, 2002 Free Software
Foundation, Inc.

   This file is free documentation; the Free Software Foundation gives
unlimited permission to copy, distribute and modify it.

Basic Installation
==================

   These are generic installation instructions.

   The `configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation.  It uses
those values to create a `Makefile' in each directory of the package.
It may also create one or more `.h' files containing system-dependent
definitions.  Finally, it creates a shell script `config.status' that
you can run in the future to recreate the current configuration, and a
file `config.log' containing compiler output (useful mainly for
debugging `configure').

   It can also use an optional file (typically called `config.cache'
and enabled with `--cache-file=config.cache' or simply `-C') that saves
the results of its tests to speed up reconfiguring.  (Caching is
disabled by default to prevent problems with accidental use of stale
cache files.)

   If you need to do unusual things to compile the package, please try
to figure out how `configure' could check whether to do them, and mail
diffs or instructions to the address given in the `README' so they can
be considered for the next release.  If you are using the cache, and at
some point `config.cache' contains results you don't want to keep, you
may remove or edit it.

   The file `configure.ac' (or `configure.in') is used to create
`configure' by a program called `autoconf'.  You only need
`configure.ac' if you want to change it or regenerate `configure' using
a newer version of `autoconf'.

The simplest way to compile this package is:

  1. `cd' to the directory containing the package's source code and type
     `./configure' to configure the package for your system.  If you're
     using `csh' on an old version of System V, you might need to type
     `sh ./configure' instead to prevent `csh' from trying to execute
     `configure' itself.

     Running `configure' takes awhile.  While running, it prints some
     messages telling which features it is checking for.

  2. Type `make' to compile the package.

  3. Optionally, type `make check' to run any self-tests that come with
     the package.

  4. Type `make install' to install the programs and any data files and
     documentation.

  5. You can remove the program binaries and object files from the
     source code directory by typing `make clean'.  To also remove the
     files that `configure' created (so you can compile the package for
     a different kind of computer), type `make distclean'.  There is
     also a `make maintainer-clean' target, but that is intended mainly
     for the package's developers.  If you use it, you may have to get
     all sorts of other programs in order to regenerate files that came
     with the distribution.

Compilers and Options
=====================

   Some systems require unusual options for compilation or linking that
the `configure' script does not know about.  Run `./configure --help'
for details on some of the pertinent environment variables.

   You can give `configure' initial values for variables by setting
them in the environment.  You can do that on the command line like this:

     ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix

   *Note Defining Variables::, for more details.

Compiling For Multiple Architectures
====================================

   You can compile the package for more than one kind of computer at the
same time, by placing the object files for each architecture in their
own directory.  To do this, you must use a version of `make' that
supports the `VPATH' variable, such as GNU `make'.  `cd' to the
directory where you want the object files and executables to go and run
the `configure' script.  `configure' automatically checks for the
source code in the directory that `configure' is in and in `..'.

   If you have to use a `make' that does not support the `VPATH'
variable, you have to compile the package for one architecture at a
time in the source code directory.  After you have installed the
package for one architecture, use `make distclean' before reconfiguring
for another architecture.

Installation Names
==================

   By default, `make install' will install the package's files in
`/usr/local/bin', `/usr/local/man', etc.  You can specify an
installation prefix other than `/usr/local' by giving `configure' the
option `--prefix=PATH'.

   You can specify separate installation prefixes for
architecture-specific files and architecture-independent files.  If you
give `configure' the option `--exec-prefix=PATH', the package will use
PATH as the prefix for installing programs and libraries.
Documentation and other data files will still use the regular prefix.

   In addition, if you use an unusual directory layout you can give
options like `--bindir=PATH' to specify different values for particular
kinds of files.  Run `configure --help' for a list of the directories
you can set and what kinds of files go in them.

   If the package supports it, you can cause programs to be installed
with an extra prefix or suffix on their names by giving `configure' the
option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.

Optional Features
=================

   Some packages pay attention to `--enable-FEATURE' options to
`configure', where FEATURE indicates an optional part of the package.
They may also pay attention to `--with-PACKAGE' options, where PACKAGE
is something like `gnu-as' or `x' (for the X Window System).  The
`README' should mention any `--enable-' and `--with-' options that the
package recognizes.

   For packages that use the X Window System, `configure' can usually
find the X include and library files automatically, but if it doesn't,
you can use the `configure' options `--x-includes=DIR' and
`--x-libraries=DIR' to specify their locations.

Specifying the System Type
==========================

   There may be some features `configure' cannot figure out
automatically, but needs to determine by the type of machine the package
will run on.  Usually, assuming the package is built to be run on the
_same_ architectures, `configure' can figure that out, but if it prints
a message saying it cannot guess the machine type, give it the
`--build=TYPE' option.  TYPE can either be a short name for the system
type, such as `sun4', or a canonical name which has the form:

     CPU-COMPANY-SYSTEM

where SYSTEM can have one of these forms:

     OS KERNEL-OS

   See the file `config.sub' for the possible values of each field.  If
`config.sub' isn't included in this package, then this package doesn't
need to know the machine type.

   If you are _building_ compiler tools for cross-compiling, you should
use the `--target=TYPE' option to select the type of system they will
produce code for.

   If you want to _use_ a cross compiler, that generates code for a
platform different from the build platform, you should specify the
"host" platform (i.e., that on which the generated programs will
eventually be run) with `--host=TYPE'.

Sharing Defaults
================

   If you want to set default values for `configure' scripts to share,
you can create a site shell script called `config.site' that gives
default values for variables like `CC', `cache_file', and `prefix'.
`configure' looks for `PREFIX/share/config.site' if it exists, then
`PREFIX/etc/config.site' if it exists.  Or, you can set the
`CONFIG_SITE' environment variable to the location of the site script.
A warning: not all `configure' scripts look for a site script.

Defining Variables
==================

   Variables not defined in a site shell script can be set in the
environment passed to `configure'.  However, some packages may run
configure again during the build, and the customized values of these
variables may be lost.  In order to avoid this problem, you should set
them in the `configure' command line, using `VAR=value'.  For example:

     ./configure CC=/usr/local2/bin/gcc

will cause the specified gcc to be used as the C compiler (unless it is
overridden in the site shell script).

`configure' Invocation
======================

   `configure' recognizes the following options to control how it
operates.

`--help'
`-h'
     Print a summary of the options to `configure', and exit.

`--version'
`-V'
     Print the version of Autoconf used to generate the `configure'
     script, and exit.

`--cache-file=FILE'
     Enable the cache: use and save the results of the tests in FILE,
     traditionally `config.cache'.  FILE defaults to `/dev/null' to
     disable caching.

`--config-cache'
`-C'
     Alias for `--cache-file=config.cache'.

`--quiet'
`--silent'
`-q'
     Do not print messages saying which checks are being made.  To
     suppress all normal output, redirect it to `/dev/null' (any error
     messages will still be shown).

`--srcdir=DIR'
     Look for the package's source code in directory DIR.  Usually
     `configure' can determine that directory automatically.

`configure' also accepts some other, not widely useful, options.  Run
`configure --help' for more details.

