[MacPorts] #67967: zfp: how to configure and build 32- and 64-bit separately for Clang builds?

[MacPorts]

#67967: zfp: how to configure and build 32- and 64-bit separately for Clang builds?
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:  universal     |       Port:  zfp
--------------------------+--------------------
 Clang builds `zfp` in one go, but 32-bit build needs special defines to
 build correctly, while 64-bit one does not. It seems these should be
 rather built separately and then glued together.

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Ticket URL: <https://trac.macports.org/ticket/67967>
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