[MacPorts] #60825: alps @2.3.0: Boost Source not Found

[MacPorts]

#60825: alps @2.3.0: Boost Source not Found
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  alps
------------------------+--------------------
 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/122481/steps
 /install-port/logs/stdio

 {{{
 CMake Error at config/FindBoostSrc.cmake:106 (message):
   Boost Source not Found
 Call Stack (most recent call first):
   config/FindBoostForALPS.cmake:75 (find_package)
   CMakeLists.txt:294 (find_package)
 }}}

 Looks like the alps port used to use a bundled copy of boost. It was then
 changed to use the boost port when alps was updated to 2.3.0. Maybe boost
 has been updated to a newer version that is no longer compatible with
 alps. Alps 2.3.0 still ships a bundled copy of boost. We should use that.
 It is recommended for projects to use their own bundled copy of boost
 because the developers of boost do not value backward compatibility.

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Ticket URL: <https://trac.macports.org/ticket/60825>
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