Tested on MinGW and Cygwin

CMakeLists.txt

@@ -27,12 +27,12 @@ if ( WIN32 AND NOT CYGWIN )
   # Windows systems
   option ( LUA_WIN "Windows specific build." ON )
   option ( LUA_BUILD_AS_DLL "Build Lua library as Dll." ON )
-  # Paths
-  set ( LUA_DIRSEP "\\" )
-  set ( LUA_LDIR "!\\lua\\" CACHE STRING "Pure Lua module location." )
-  set ( LUA_CDIR "!\\" CACHE STRING "Binary Lua module location."  )
-  set ( LUA_PATH_DEFAULT ".\\?.lua;${LUA_LDIR}?.lua;${LUA_LDIR}?\\init.lua;${LUA_CDIR}?.lua;${LUA_CDIR}?\\init.lua" )
-  set ( LUA_CPATH_DEFAULT ".\\?${CMAKE_SHARED_MODULE_SUFFIX};${LUA_CDIR}?${CMAKE_SHARED_MODULE_SUFFIX};${LUA_CDIR}loadall${CMAKE_SHARED_MODULE_SUFFIX}" )
+  # Paths (Double escapes needed)
+  set ( LUA_DIRSEP "\\\\" )
+  set ( LUA_LDIR "!\\\\lua\\\\" CACHE STRING "Pure Lua module location." )
+  set ( LUA_CDIR "!\\\\" CACHE STRING "Binary Lua module location."  )
+  set ( LUA_PATH_DEFAULT ".\\\\?.lua;${LUA_LDIR}?.lua;${LUA_LDIR}?\\\\init.lua;${LUA_CDIR}?.lua;${LUA_CDIR}?\\\\init.lua" )
+  set ( LUA_CPATH_DEFAULT ".\\\\?${CMAKE_SHARED_MODULE_SUFFIX};${LUA_CDIR}?${CMAKE_SHARED_MODULE_SUFFIX};${LUA_CDIR}loadall${CMAKE_SHARED_MODULE_SUFFIX}" )
 else ()
   # Posix systems (incl. Cygwin)
   option ( LUA_USE_POSIX "Use POSIX functionality." ON )