Error: CMAKE_MAKE_PROGRAM is not set for Windows

```
$ cmake ..
CMake Error: CMake was unable to find a build program corresponding to "Unix Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
See also "xc8-cmake-template/build/CMakeFiles/CMakeOutput.log".
```