Cannot build on macos
src/Wt/WServerGLWidget.C:24:10: fatal error: GL/gl.h: No such file or directory 24 | #include <GL/gl.h> | ^~~~~~~~~ compilation terminated.
Google says that there is not GL/gl.h on apple platform.
That file contains also following code
#ifdef APPLE_GL #include <OpenGL/OpenGL.h> ...
Commenting that include helps.
So include must be under some ifdef.
No data to display