Easiest way to use Linux system C files / tiny C libraries

[Chris Katko]

What's the easiest way to use POSIX and Linux-specific C include 
files?

I know you can write a wrapper but it seems like half the time 
these files include 20 files which include 20 files which use 
strange enums, arrays, etc that don't clearly have answers on how 
to wrap them.

Is there something I'm missing?

For example, right now, the most recent problem I've had related 
to this is wanting to use the libprocps-dev library. All it does 
is expose the /proc/ process data in an easy-to-use format.

I "could" write my own in D but then once again, I've not solved 
my re-occurring problem of "what if I DO need a C library."

Do I need to implement every piece of a C header / library, or 
can I get away with a tiny subset that I'm actually using?

I don't know. I know this is all vague. But I've run into this 
problem multiple times and every time, after hours of googling, 
never gotten anywhere.

Thanks.