> make -v
GNU Make 4.0
Built for x86_64-pc-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.
time make
real 24m25.219s
user 23m7.528s
sys 0m38.548s
time make -j 2
real 14m4.818s
user 26m19.948s
sys 0m44.780s
time make -j 4
real 11m28.407s
user 42m24.484s
sys 1m6.820s
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