The ExtUtils::MakeMaker documentation directs you to ExtUtils::MM_Unix for documentation of all MakeMaker methods, where it says:
c_o (o)
    Defines the suffix rules to compile different flavors of C files to object files.
To see what that looks like, open up a generated Makefile and look for "MakeMaker c_o section:".

In reply to Re^2: MakeMaker-Makefile Reform School by ysth
in thread MakeMaker-Makefile Reform School by Intrepid

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