You should probably disable python support more directly:
make NO_LIBPYTHON=1
That being said, this issue was introduced with the following commit:
31160d7feab786c991780d7f0ce2755a469e0e5e
namely due to:
... Also fix an issue where _get_attempt was called with only
one argument. This prevented the error message from printing
the name of the variable that can be used to fix the problem.
specifically:
-$(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2)))
+$(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2),$(1)))
The "missing" argument was in fact missing on purpose; it's a signal
that the error message should be skipped, because the failure was due
to the default value, not the user-supplied value.
That being said, I think there's room for improvement; for instance,
the error handling should perhaps not belong there. I will look into
it presently.