NWNX on a Linux server help

[Legacy_entropyrat]

                Hello all, 

I'm attempting to install and get NWNX running on a CentOS 6 server and seem to be unable to do so. I've done everything I can find in the documentation I can find yet I can't actually get NWNX to fully load on account of this error: 

NWN Extender v2.7-beta4 
* NWNX2 activated. 
FAILED: NWNX!INIT has not been initialized. 

Can anyone please offer some insight?
               
               

               
            

[Legacy_entropyrat]

               So I gave up on the pre-compiled version due to an utter lack of documentation. I've moved on and have tried compiling myself, only now I'm running into an issue that makes no sense.

The error is:
Checking for inflateEnd in -lz... no
Unable to find -lz (zlib). Please install a zlib developer's package.

Only I have zlib and zlib-devel completely up to date.

[/home/entropy/NWNServer/nwnx]# whereis zlib
zlib: /usr/include/zlib.h /usr/share/man/man3/zlib.3.gz

Any idea what the problem is here? Thanks again.