BSD-Style Interval Timer and New BSD Signal Interface

[The Honorable Aaron Jay Greenfield Esquire]

I want to compile a tetris game from the net on the computer in my
office.  We are using Zenix System V version 2.3.2 on a Dell 386.

According to the documentation, the program requires a BSD-Style 
Interval Timer and new BSD Signal Interface. 

How would I go about acquiring the needed library module containing 
the functions used (sigvec, setitimer, sigblock, sigsetmask) ?

Would getting these interfaces involve/necessitate upgrading the operating 
system?

Thanks for any insight....           Aaron Greenfield
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What is a ratserv anyway ?