Minimal set of changes to Lua so it can be called from within an iOS app within Apple API constraints:

• Xcode project to create dynamic libraries
• rename main to lua_main and luac_main
• rename system to ios_system
• erase all memory when leaving the program

• Run the shell script get_lua_source.sh with sh get_lua_source.sh. It will download the source and patch a few files.
• open lua_ios.xcodeproj
• hit "Build" in Xcode.
• you're done. You now have a lua.framework that you can link with your projects.
• if you plan to call system commands from lua (ls, rmdir, curl...) you will need to link with the ios_system framework. Same if you want to call lua commands using system() calls.
• if you only need Lua without any calls to system functions, comment calls to system() and do not link with ios_system.