Quanta make fails

[Tom Smith]

ENVIRONMENT
FreeBSD 4.8-RELEASE
KDE 3.1
Quanta 3.1

When I run make in the Quanta source directory I get the following error:

/usr/include/sys/cdefs.h:273: warning: '_POSIX_C_SOURCE' is not defined
/usr/include/sys/cdefs.h:279: warning: '_POSIX_C_SOURCE' is not defined

After some research, I found that it was recommended (err, required) to 
run gmake to compile it. When I run gmake, I get:

Makefile:20: *** missing separator.  Stop

I haven't been able to find any further information on this issue or 
what I need to do to resolve it. I think it's a problem with my box (the 
problem also occurs when I try to compile kdevelop) but I don't know 
where to start looking.