I'm sorry to ask this simple question. However, if someone with the same question, the anwser is : https://sourceforge.net/p/flibs/svncode/HEAD/tree/trunk/
I have read the document and knows the strings/keyvars.f90. However when I download the flibs-0.9, there is no such file. So where I can get this file? Thanks very much!
When I use Visual Studio to create a Qt GUI Application or use Qt Creator to create a Qt Widgets Application, I just put "#include "mgl2/mgl.h"" in the mainwindow.h , and "mglGraph* gl = new mglGraph();" in the MainWindow::MainWindow() of mainwinidow.cpp, then the complier tells me a LNK2005 error and a LNK1169 error as follows: qtmaind.lib(qtmain_win.obj):-1: error: LNK2005: "public: __cdecl std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct...