Experimental Physics and
Industrial Control System

I am trying with 

seq-2.0.11.tar.gz

That is an old version of the sequencer. Its download page [1] very clearly shows the version of base it works with, in this case 3.14.8
Maintainership of the sequencer module has moved. Please use a recent version of the sequencer, available on its current home [2], which will compile and work without problems with a recent version of base. The EPICS web site [3] also points to the current home of the sequencer.

Cheers,
~Ralph

ps. Could someone at SLAC please put a prominent "outdated" note on the old sequencer page, with a link pointing to its current home? Thank you!

[1] http://www.slac.stanford.edu/grp/cd/soft/epics/sequencerhttp://www.aps.anl.gov/epics/modules/soft.php