将Numlua放在LUA_PATH上。

我尝试将numlua放在我的LUA_PATH中，以便我可以从任何地方使用它。它目前位于/usr/local/lib/lua/5.1/numlua。我可以成功地从/usr/local/lib/lua/5.1/numlua内部要求它（numlua）。目前，我有默认的LUA_PATH：

require "numlua"...

no file './numlua.lua'
no file '/usr/local/share/lua/5.1/numlua.lua'
no file '/usr/local/share/lua/5.1/numlua/init.lua'
no file '/usr/local/lib/lua/5.1/numlua.lua'
no file '/usr/local/lib/lua/5.1/numlua/init.lua'
no file '/usr/share/lua/5.1/numlua.lua'
no file '/usr/share/lua/5.1/numlua/init.lua'
no file './numlua.so'
no file '/usr/local/lib/lua/5.1/numlua.so'
no file '/usr/lib/x86_64-linux-gnu/lua/5.1/numlua.so'
no file '/usr/lib/lua/5.1/numlua.so'
no file '/usr/local/lib/lua/5.1/loadall.so'

然而，当我尝试从其他地方（例如~/）要求"numlua.numlua"时：

error loading module 'numlua.numlua' from file '/usr/local/lib/lua/5.1/numlua/numlua.so':
    /usr/local/lib/lua/5.1/numlua/numlua.so: undefined symbol: luaopen_numlua_numlua

（不用说，require"numlua"不起作用）。我也尝试过更改我的LUA_PATH，但是每当目录/文件在我的LUA_PATH上时，我总是遇到undefined symbol error。解决这个问题的最好方法是什么？