The easiest way is to run make --version . For example, on my machine, it displays:
mureinik@computer ~$ make --version GNU Make 4.0 Built for x86_64-redhat-linux-gnu Copyright (C) 1988-2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
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