Installation Instructions for HDF4 on UNIX and MacOSX Platforms
    ===================================================================

CONTENTS

0. Third party software requirements
1. Optional SZIP compression Library
2. HDF4 source code and precompiled binaries 
3. UNIX and MacOSX configuration and build
4. Using HDF/MFHDF libraries with the netCDF library (libnetcdf.a)


0. Third party software requirements
   =================================

   x C and Fortran compilers
     If Fortran compiler is not available, use --disable-fortran configure flag
     to build HDF4 C library and utilties. For the list of the supported 
     compilers see RELEASE.txt in the release_notes directory.

   x JPEG distribution release 6b or later (libjpeg.a(so)). Source can be 
     downloaded from http://www.ijg.org/ 

   x ZLIB 1.1.4(libz.a) or later. Source code and binaries may be 
     downloaded from this site:
         http://www.gzip.org/ 
     They are also available on The HDF Group's FTP server:
         ftp://ftp.hdfgroup.org/lib-external/zlib/

1. Optional SZIP compression Library
   =================================

   x HDF4 may be configured to use the SZIP compression Library.
     For more information about the SZIP library, see this site:

         http://hdfgroup.org/doc_resource/SZIP/ 

     The SZIP compression library is free for non-commercial use; 
     see http://hdfgroup.org/doc_resource/SZIP/Commercial_szip.html
     for information regarding commercial use.
     
2. HDF4 source code and precompiled binaries
   =========================================
   The HDF Group (THG) provides a "tar source ball" and precompiled 
   binaries from the THG FTP server: 

         ftp://ftp.hdfgroup.org/HDF/HDF_Current/src
         ftp://ftp.hdfgroup.org/HDF/HDF_Current/bin 
   
   Starting with the HDF 4.2.6 release binaries are packed  with 
   the ZLIB, JPEG and SZIP libraries used to build the binaries. 

   IMPORTANT:
   ==========
   HDF4 prebuilt utilties come with SZIP compression. To use these binaries, 
   you must install the SZIP Library on your system. 

   You may download precompiled SZIP binaries from the THG FTP site:
         ftp://ftp.hdfgroup.org/lib-external/szip/2.0/bin/
   Source code for the SZIP library can be found on the same server:
         ftp://ftp.hdfgroup.org/lib-external/szip/2.1/src

   To build the SZIP library, follow the instructions in the SZIP source code 
   distribution.

3. UNIX and MacOSX configuration and build
   =======================================

   0)  See RELEASE.txt in the release_docs/ subdirectory for platforms 
       tested for this release.

   Before you start:

   1)  Make sure that the ZLIB and JPEG Libraries are installed on your
       system.

   2)  Optional: Install the SZIP version 2.1 Library (you may use 
       SZIP 2.0 binaries). 

   3)  Extract the source from the hdf-X.Y.Z.tar file and change
       directory to hdf-X.Y.Z.

   To Configure:

   4)  Use the configure command in the top level HDF4 directory hdf-X.Y.Z:

       ./configure --with-zlib=/path_to_ZLIB_install_directory 
                   --with-jpeg=/path_to_JPEG_install_directory 
                   <--with-szlib=/path_to_SZIP_install_directory>
                   --prefix=/path_to_HDF4_install_directory

       * Please note that when the szlib option is not used, the SZIP 
         Library will not be configured in and SZIP compression will not 
         be enabled.
       * If your system has ZLIB and/or JPEG libraries installed under a
         system library directory (such as /usr/lib), configure will
         automatically find the library. In this case, the corresponding
         configure flag may be ommitted.
       * Note that --prefix defines where the installation path is.
         The default is set as <hdf4_build_directory>/hdf4.

   To Build and Test:

   5)  To build the library:

       gmake >& gmake.out

   6)  To build and run the tests:

       gmake check >& check.out

   To Install:

   7)  To install the HDF4 library and tools:

       gmake install

   8)  To install C and Fortran examples
    
       gmake install-examples

   9)  To test installation 

       gmake installcheck

   10) By default, the current configuration uses vendor compilers; to use
       another compiler, run the following commands before running configure: 

       setenv CC   "foo -flags"
       setenv F77  "fffoo -flags"

       See the configure help page (configure --help) for a list of
       environment variables that have an affect on building the library.

   11) You may build HDF4 in a directory other than hdf-X.Y.Z by using
       the "srcdir" option. Simply create a build directory and type:

       <path_to_hdf-X.Y.Z>/configure ...

       where "..." are your configuration options.

4. Using HDF/MFHDF libraries with the netCDF library (libnetcdf.a)
   ===============================================================

   To use the HDF/MFHDF libraries (libdf.a, libmfhdf.a) with the 
   netCDF library (libnetcdf.a), the HDF4 distribution must be configured 
   with the --disable-netcdf configuration flag. 

   When this flag is used, the HDF versions of the C netCDF functions 
   (as of netCDF version 2.3.2) are renamed from ncxxx to sd_ncxxx, 
   and HDF Fortran netCDF wrappers are disabled to avoid name clashed with 
   the netCDF C and Fortran functions from libnetcdf.a

   Please report all problems to help@hdfgroup.org.