Log Message:
If you have ptyfs set up and this package detects it, it assumes you
must be on System V and also have STREAMS. Avoid the STREAMS code for
NetBSD.

Note: I haven't tested this or even looked at any of the code except
for what was trying to use STREAMS, so it may not work; but now it at
least builds, and the behavior if ptyfs is not detected is unchanged.