[CMake] CMake 3.7.2 and parallel builds

[Dave Flogeras]

I've recently upgraded to CMake 3.7.2 (and gnu make-4.2.1). Now, when I
execute 'make -j5 NightlyBuild', I get the following new (to me) warning:

"gmake[4]: warning: jobserver unavailable: using -j1.  Add '+' to parent
make rule."

If I downgrade make back to the previous version, 4.1-r1 (the -r1 is
Gentoo), the warning goes away again.

If I use CMake-3.6.3 (my previous version) with make-4.2.1, the warning is
still there.

Is this a known issue?  Is it something I am doing wrong in my scripts?

Thanks,
Dave
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