Follow-up Comment #2, bug #50062 (project make):
Similarly, the $(error ...) function and indeed functions like this themselves
are features only found in GNU make... so even if you were using some other
implementation of make that happened to support "ifndef" the same way GNU make
did, it could very well simply treat that function call as a variable
reference, to a non-existent variable which expands to the empty string, and
just ignore the entire check and continue on its way.
Basically, you're trying to use GNU make-only constructs to test whether
you're running GNU make and fail if not. That is a catch-22.
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