[MacPorts] #70689: MyPaint @2.0.1_1: Crashes on startup; after rebuilding from source, RuntimeError: Unknown install type; could not determine paths

[MacPorts]

#70689: MyPaint @2.0.1_1: Crashes on startup; after rebuilding from source,
RuntimeError: Unknown install type; could not determine paths
----------------------+------------------------
  Reporter:  RobK88   |      Owner:  ryandesign
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.10.1
Resolution:  fixed    |   Keywords:  elcapitan
      Port:  MyPaint  |
----------------------+------------------------

Comment (by RobK88):

 @ryandesign -- I installed myPaint @2.0.1_2.  MacPorts built it from
 source.  But it still crashes on El Capitan...  I will attach the crash
 report.


 {{{
 grinch$ sw_vers
 ProductName:    Mac OS X
 ProductVersion: 10.11.6
 BuildVersion:   15G22010

 grinch$ port installed mypaint
 The following ports are currently installed:
   MyPaint @2.0.1_1
   MyPaint @2.0.1_2 (active)

 grinch$ MyPaint
 INFO: mypaint: Installation layout: conventional POSIX-like structure with
 prefix '/opt/local/Library/Frameworks/Python.framework/Versions/3.8'
 WARNING: gui.userconfig: Failed to load settings file:
 /Users/grinch/.config/mypaint/settings.json
 WARNING: gui.userconfig: Failed to load settings: using defaults
 INFO: gui.main: No locale setting found, using system locale
 Segmentation fault: 11
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/70689#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS