[MacPorts] #48927: lang/julia 1) missing libarpack dependency and 2) cannot find gcc5/libgcc_s.10.4

[MacPorts]

#48927: lang/julia 1) missing libarpack dependency and 2) cannot find
gcc5/libgcc_s.10.4
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 Reporter:  slewsys@…  |      Owner:  macports-tickets@…
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.3.99
 Keywords:             |       Port:
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 Two issues  building lang/julia variant gcc5 with Xcode 7 on Yosemite:

 1) The Portfile for lang/julia unconditionally sets:

    USE_SYSTEM_ARPACK=1

 but fails to list arpack as a library dependecy.

 2) During build (or rather, destroot), it fails to find libgcc_s.10.4.
 This can be resolved by symlinking:

    libgcc_s.10.4.dylib => $(prefix)/lib/gcc5/libgcc_s.1.dylib

 Not sure if the issue lies with gcc5 install,  julia configuration or
 something else.

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Ticket URL: <https://trac.macports.org/ticket/48927>
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