Arch Linux

The lua-zlib packages installs its zlib.so file in /usr/share/lua/5.1. The correct path for a .so would be /usr/lib/lua/5.1, because lua only looks for .lua files in /usr/share/lua and .so files in /usr/lib/lua.

(The upstream source tree has the correct path in Makefile, but not in CMakeLists.txt...)

At the moment, lua can't even use this package:

$ lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require('zlib')
stdin:1: module 'zlib' not found:
no field package.preload['zlib']
no file './zlib.lua'
no file '/usr/share/lua/5.1/zlib.lua'
no file '/usr/share/lua/5.1/zlib/init.lua'
no file '/usr/lib/lua/5.1/zlib.lua'
no file '/usr/lib/lua/5.1/zlib/init.lua'
no file './zlib.so'
no file '/usr/lib/lua/5.1/zlib.so'
no file '/usr/lib/lua/5.1/loadall.so'
stack traceback:
[C]: in function 'require'
stdin:1: in main chunk
[C]: ?
>

(This also breaks the compression module of Prosody, which is how I found this bug in the first place).

Changing the path in the PKGBUILD fixes the problem.