[MacPorts] #55120: TeXShop3 @3.88 aqua/TeXShop3 not building on OS X Sierra 10.12.6

[MacPorts]

#55120: TeXShop3  @3.88  aqua/TeXShop3 not building on OS X Sierra 10.12.6
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 Reporter:  danichcr72        |      Owner:
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.4.2
 Keywords:  TexShop3, Sierra  |       Port:  TexShop3
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 I'm seeing the following errors when installing TexShop3 on my Mac laptop:

 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_TeXShop3/TeXShop3/work/texshopsource388/Sources/TSDocument.m:1793:17:
 error: 'release' is unavailable: not available in automatic reference
 counting mode
                 dispatch_release(dispatch_source);

 (This error is repeated twice).

 I have attached the verbose log generated by port -v install TexShop3.

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Ticket URL: <https://trac.macports.org/ticket/55120>
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