Hi all,

I need a bit of help with GRASS GIS compiled with cygwin and Windows
10. Right after a Cygwin update,
a few weeks ago, my GRASS 7.2 gui stopped working with a cryptical
Cygwin-related error message reported below.
I tried rolling back a few wxPython-related Cygwin packages to
previous versions, but I had no luck. I also run rebase
a few times, as suggested to heal similar problems in some web
location. Same result going to grass74 (to which the
errors above refer). The source package is here:
https://grass.osgeo.org/grass74/source/grass-7.4.0.tar.gz
and the list of options used to compile GRASS and a cygcheck dump are
attached here!

----- --- -- -
GRASS 7.4.0 (italia):~ >       1 [main] python2.7 8396
child_info_fork::abort: unable to map
C:\cygwin64\bin\cygSDL2-2-0-0.dll, Win32 error 1114
Unable to import pyGRASS: grass_gis.7.4.0 not found.
Some functionality will be not accessible
      1 [main] python2.7 3616 child_info_fork::abort: unable to map
C:\cygwin64\bin\cygSDL2-2-0-0.dll, Win32 error 1114
Traceback (most recent call last):
  File "/home/alvioli/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/wxgui.py",
line 167, in <module>
    sys.exit(main())
  File "/home/alvioli/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/wxgui.py",
line 154, in main
    app = GMApp(workspaceFile)
  File "/home/alvioli/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/wxgui.py",
line 48, in __init__
    wx.App.__init__(self, False)
  File "/usr/lib/python2.7/site-packages/wx-3.0-gtk3/wx/_core.py",
line 8628, in __init__
    self._BootstrapApp()
  File "/usr/lib/python2.7/site-packages/wx-3.0-gtk3/wx/_core.py",
line 8196, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File "/home/alvioli/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/wxgui.py",
line 101, in OnInit
    workspace=self.workspaceFile)
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/lmgr/frame.py",
line 130, in __init__
    self._moduleTreeBuilder =
LayerManagerModuleTree(message_handler=add_menu_error)
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/lmgr/menudata.py",
line 69, in __init__
    message_handler=message_handler)
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/core/menutree.py",
line 72, in __init__
    expAddons(xmlTree)
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/core/toolboxes.py",
line 372, in expandAddons
    _expandAddonsItem(root)
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/core/toolboxes.py",
line 556, in _expandAddonsItem
    addons = _getAddons()
  File "/cygdrive/c/macs/local/grass74_inst/grass-7.4.0/gui/wxpython/core/toolboxes.py",
line 515, in _getAddons
    output = gcore.read_command('g.extension', quiet=True, flags='ag')
---- --- -- -

I really got stuck on this!