My program came with error of “GL_HISTOGRAM was not declared”, but I did include <gl.h> at its header. Is it correct? Tks.
You need to include <glext.h>, too. The latest version is always available here: http://www.opengl.org/registry/api/glext.h
Hi, Stephen A,
Thanks. But, after I added, the same error still existed. Any other recommended? Tks.