Follow-up Comment #1, bug #45211 (project make): The claim being, I presume, that the second RM='' should either be RM='rm -f' or RM='rm', the latter only being the case if changing MAKEFLAGS takes effect implausibly quickly. It's the former with a Debian Wheezy make 3.81 (origin says "default"), but empty (origin says "undefined"), per the OP, with git's 4.1.90. As you'd hope, a more normal operation is fine: it's the latter when running make -R aka --no-builtin-variables, with either version.
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