The OS may not have Python (slapos-node package does not depend
on any version of Python). Another possible issue was found on Suse:

  make[3]: Entering directory '.../parts/glib__compile__/glib-2.56.4/gio'
    GEN      gdbus-daemon-generated.c
  Traceback (most recent call last):
    File "./gdbus-2.0/codegen/gdbus-codegen.in", line 53, in <module>
      from codegen import codegen_main
    File ".../parts/glib__compile__/glib-2.56.4/gio/gdbus-2.0/codegen/codegen_main.py", line 30, in <module>
      from . import parser
    File ".../parts/glib__compile__/glib-2.56.4/gio/gdbus-2.0/codegen/parser.py", line 23, in <module>
      import xml.parsers.expat
  ImportError: No module named xml.parsers.expat