[MacPorts] #34458: netcdf: Remove szip dependency

[MacPorts]

#34458: netcdf: Remove szip dependency
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 Reporter:  eborisch@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement            |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.1.0                                
 Keywords:                         |        Port:  netcdf                               
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Comment(by eborisch@…):

 Not redistributable is the cleanest way to describe it. As I read it, the
 license for szip is convoluted and depends on if it is being used through
 HDF5 or not.

 Taken from http://www.hdfgroup.org/doc_resource/SZIP/

 szip is only required if you are actually reading or writing szip-
 compressed data. If it is needed, the user should install hdf5-18 +szip
 (which will build from source) before installing netcdf. The netcdf port
 itself shouldn't directly require szip (IMHO) as it is not directly using
 it, but only through the hdf5-18 port if it has been installed with +szip.

 I haven't tested to see if a netcdf build against a non-szip enabled
 libhdf5 will function with a (locally compiled) szip-enabled libhdf5.

  -Eric
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 Licensing terms


 The version of Szip distributed with HDF products is free for non-
 commercial use, which may occur in two sets of circumstances:

 Non-commercial users may use the Szip software integrated with HDF
 products to both encode (compress) and decode (uncompress) data. This
 applies to educational and research applications.

 Commercial users may use the software to decode any data. Further, they
 may use the software in internal activities that do not involve or result
 in the development of an Szip-based software product.

 Commercial licenses are available for commercial users who wish to
 distribute an Szip-based software product or engage in commercial uses
 that are not allowed above. For further licensing information or to view a
 copy of the Szip copyright statement, see Commercial use terms and the
 copyright and license notice pertaining to Szip in HDF products.

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Ticket URL: <https://trac.macports.org/ticket/34458#comment:2>
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