错误C1083:不能打开包含文件:“FL/ FL”。没有这样的文件或目录。

First of all I'm still new here and therefore have no idea how to format the code so it looks neat in this question, I hope this is acceptable. I am following the programming principles and practice from Stroustrup. You might guess what the problem is...yes FLTK instalation. I have followed all the steps carefully to build the project in VS C++ 2013; pages 1204-1206. (I've done appendix C successfully, having to do with std_lib_facilities.h).First of all I'm still new here and therefore h