I've had three systems now affected by this bug, when building
nvidia-190 kernel modules.  Same issue with nvidia-185 as well, this
seems highly related to bug 438393 as noted above, but since it does not
involve the environment variables I'm posting here.

The build fails with the same make.log as 438393 "The C compiler
'/usr/local/bin/cc' does not appear to be able to create executables",
in this case a link to ccache.  The referenced bug also mentions that
dkms tries to run as user nobody, running as nobody ccache tries to
create a cache at "/nonexistent/.ccache" which of course fails.  Hope
this is helpful.

-- 
ccache causes DKMS builds to fail
https://bugs.launchpad.net/bugs/444290
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