LuaBitOp: Cant require "bit=>./bit.so: undefined symbol: luaopen_bit

[meino.cramer@...]

Hi,

I am trying to get LuaBitOp to work.
On a GENTOO Linux system (AMD64), which is updated and maintained on a
daily base, I did a 

    make

and 

    make install

, which works fine and installs bit.so into

    /usr/local/lib64/lua/5.1/bit.so

.

In the enviroment this is defined:

LUA_PATH=/usr/lib64/lua/luarocks/share/lua/5.1//?.lua;/usr/lib64/lua/luarocks/share/lua/5.1//?/init.lua;/usr/share/lua/5.1//?.lua;/usr/share/lua/5.1//?/init.lua;/usr/lib64/lua/luarocks/share/lua/5.1/?.lua;/usr/lib64/lua/luarocks/share/lua/5.1/?/init.lua;/usr/share/lua/5.1/?.lua;/usr/share/lua/5.1/?/init.lua;./?.lua;/usr/local/share/lua/5.1/?.lua;/usr/local/share/lua/5.1/?/init.lua;/usr/local/lib/lua/5.1/?.lua;/usr/local/lib/lua/5.1/?/init.lua;/usr/share/lua/5.1/?.lua;/usr/share/lua/5.1/?/init.lua
LUA_CPATH=/usr/lib64/lua/luarocks/lib/lua/5.1//?.so;./?.so;/usr/local/lib/lua/5.1/?.so;/usr/lib/lua/5.1/?.so;/usr/local/lib/lua/5.1/loadall.so
s

A script containing 'require "bit"' leads to this:


    lua: error loading module 'bit' from file './bit.so':
        ./bit.so: undefined symbol: luaopen_bit
    stack traceback:
        [C]: ?
        [C]: in function 'require'
        bittest.lua:3: in main chunk
        [C]: ?
    make: *** [test] Error 1


What did I wrong? How can I fix this? 

Thank you very much in advance for any help!
Best regards,
mcc