[MacPorts] #28276: Upgrade ARB 5.2 -> 5.2.1

[MacPorts]

#28276: Upgrade ARB 5.2 -> 5.2.1
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 Reporter:  matt.cottrell@…       |       Owner:  macports-tickets@…                   
     Type:  update                |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  1.9.2                                
 Keywords:  libpng                |        Port:  arb                                  
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Comment(by matt.cottrell@…):

 Replying to [comment:2 jmr@…]:
 > Linking against the libpng in /usr/X11R6 is not acceptable. Please
 [http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt
 update] the code for compatibility with libpng14 if possible, otherwise
 create a libpng12 port if it's really impossible. Also, you should not
 choose whether to build 64-bit based solely on the OS version. Look at
 $build_arch.

 I would prefer to stick with my current approach, choosing 64-bit vs
 32-bit based on the OS version.  The build_arch variable appears to be
 overly conservative.  On both of my machines running OS 10.6 (Intel Xeon
 CPU X5482 @ 3.20GHz and Intel Core2 Duo CPU P8700 @ 2.53GHz)  build_arch
 is set to i386 in the macports.conf file.  64-bit ARB runs just fine on
 both of them.

 Truth be told, the only useful version of ARB is 64-bit because modern DNA
 sequences databases are so large.
 Users would be better served if ARB would not install if a combination of
 hardware and OS was detected that absolutely cannot run 64-bit.  Any
 insight on accomplishing that?

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Ticket URL: <https://trac.macports.org/ticket/28276#comment:4>
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