[[!meta  title="warning:  Clock skew detected"]]
[[!meta  date="2009-05-08 14:56:46"]]

I was running `make` to build [[Comedi]] against the current Hardy
kernel, and it died with

    ...
    make[1]: Warning: File `Makefile' has modification time 1.1e+02 s in the future
    make[1]: Nothing to be done for `clean-am'.
    make[1]: warning:  Clock skew detected.  Your build may be incomplete.
    make[1]: Leaving directory `/thor/wking/src/lab/comedi/comedi-build'
    make: warning:  Clock skew detected.  Your build may be incomplete.

“No problem,” thinks I, since I'd just rebooted into the new kernel,
but I'd pulled the source in under the old kernel.  I'll just `touch`
all the files to make sure their times are in the past.

Nope.  Same error.  Turns out my `touch` is from the future:

    $ date; ll include/Makefile; touch include/Makefile; ll include/Makefile; date
    Fri May  8 10:48:35 EDT 2009
    -rw-r--r-- 1 wking wking 15540 2009-05-08 10:48 include/Makefile
    -rw-r--r-- 1 wking wking 15540 2009-05-08 10:50 include/Makefile
    Fri May  8 10:48:35 EDT 2009

This is because my files are NFS mounted from another computer, and
the clocks were out of sync by two minutes.  Time to setup
[NTP](http://www.ntp.org/) for the lab LAN ;).

[[!tag tags/linux]]