Importing NanoBlogger post "warning: Clock skew detected"

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+[[!meta  title="warning:  Clock skew detected"]]
+[[!meta  date="2009-05-08 14:56:46"]]
+I was running `make` to build [Comedi](http://www.comedi.org/) 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  linux]]