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Re:An opinionated approach to GNU Make by panpanna on Tuesday December 17, 2019 @12:15PM (#21815783)
Of course emacs did not "detect" your non-standard makefile.

It is your responsibility to let editors know that, be adding that magical first line to your make.

Re:An opinionated approach to GNU Make by bauerd on Tuesday December 17, 2019 @03:10PM (#21818182)
Not sure who you're responding to. I don't blame anything here, just illustrate what might cause confusion of tabs and spaces in Makefiles, namely unexpected filename suffixes. Holds true for other editors besides Emacs obviously.