How do i do it?
I used
sudo pisi it zlib-32bit
I get
System error. Program terminated.
Repo item zlib-32bit not foundI don't get it.
This ^^^ is 100% correct.
Do you have a l686 or x86_64 system.
In other words, what is the result of
pisi lr

And from the answer/result I can detect which system you have and can give further instructions.
And I also very much doubt whether
these instructions from nkoc are 100% OK.
For instance: "For 32 bit Users:" and "libpng12-32bit" do not go together.
Now the Safety switch: system.devel problem is not showing up. And I haven't done anything at all.
This ^^^ isn't 100% correct as I also can
Safety switch: system.devel is already installedAnd system.devel is only a number ~100 packages which should be installed before a "pisi bi" can be successful.
On top of this there are (can be) an number of additional <BuildDependencies> (listed in pspec.xml) packages for a successful build of the package.