Follow-up Comment #1, bug #54870 (project make):
The special variable .FEATURES is intended to help solve this problem.
Unfortunately we don't always get every single feature added to this
variable.
However in the case of $(or ...) that function was added in the same release
(3.81) that the .FEATURES variable was introduced. So, it should be
sufficient to check if this variable is not empty:
ifneq (,$(.FEATURES))
$(info have "or" function)
endif
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