How can "f90gl"(William F. Mitchell) coexist with module "dfopngl"? In my project, I want to call some subroutine in f90gl, such as "glutCreateWindow", "glutMainLoop", "glutAddSubMenu", because I want to create a new window in console project. In addition, I also want to call some subroutine in module "dfopngl" in CVF, such as "fglCallLists", "fglRasterPos3d", because I want to output some text in window which can rotate with objects. But when I let them coexist, they don''t work. Can anyone tell me what is the problem? How should I do? My aim is below: In my console project, I can create new display windows, in every new window, I can draw some objects, output some characters, pop-up some menus and rotate the objects and characters. How can I realize my requirement?