> I just found the following conflicts:

Hmm.  Is your application redefining const between where these header
files are included?  Some of those declarations are exactly identical
(getopt, getsubopt).

> May be the signal and getopt stuff should be removed from unistd.h
> and replaced by an include of signal.h and stdlib.h.

What header files a given header file may #include is restricted by 
the various standards (POSIX.1, ANSI, etc.) NetBSD tries to conform
to.  This is because those standards mandate what identifiers are
reserved when a particular header is included.  

	--jtc