[MacPorts] #62963: py39-astropy-healpix fails to install

[MacPorts]

#62963: py39-astropy-healpix fails to install
--------------------------------+--------------------------------
 Reporter:  entaylor            |      Owner:  (none)
     Type:  defect              |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:  2.7.0
 Keywords:  py-astropy-healpix  |       Port:  py-astropy-healpix
--------------------------------+--------------------------------
 I'm on Mac OS X Big Sur, v11.2.3, and XCode v12.5.  This is having fully
 uninstalled and cleaned both pip and macports, and then upgrading from
 py3.6 to py3.9 for astropy.

 I've successfully re-installed standards like ipython, numpy, scipy,
 matplotlib etc., and both py-astropy and py-photutils.  I am unable to
 install py-astropy-healpix.  This also prevents me from installing py-
 reproject, which depends on py-astropy-healpix.

 I had previously found in the error log messages like "package 'pip' is
 not available" or similarly for 'wheel' and then 'setuptools_scm'.  Having
 independently installed py39-pip and py39-wheel py39-setuptools_scm, these
 messages went away, and i now have a successful installation.  So i assume
 that these are missing dependencies?

-- 
Ticket URL: <https://trac.macports.org/ticket/62963>
MacPorts <https://www.macports.org/>
Ports system for macOS