Ok, here is my installing feedback about the "HOpenGL-1.01 compatibility release pack for GHC-5.02": ** 1 ** Besides the following thing appears in the "configure" step: checking for GL/glut.h... yes and besides the glut.h directory IS in my cygwin.bat PATH, I got a very boring error during the "make" step: C:\WINDOWS\TEMP\ghc-476717.hc:4: GL/glut.h: No such file or directory The solution I used was replacing all "-#include <GL/glut.h>" by the absolute path of glut.h (in my case, "-#include <c:/usr/include/GL/glut.h>") in the HOpenGL files. That worked fine, but why did it happen? ** 2 ** During the "make" step, I got a LOT of warnings like: * Warning: Defined but not used: [...] * C:\WINDOWS\TEMP\ghc-432219.hc:71: warning: assignment discards qualifiers from pointer target type * Warning: Module `GL_VertexSpec' is imported, but nothing from it is used But I guess this happens because this is a "compatibility release", am I right? ** 3 ** After all the compilation process, when I tryied to run "hello.exe", I got the following messages in cygwin: opengl.dll not found (this appeared in a pop-up window) BASH.EXE: ./hello: Permission denied (in the cygwin shell) Trying to run the same example in the Windows Explorer, I got: glut.dll not found (pop-up window) I remember I needed to copy glut.dll to my "redboot_HS" in HOpenGL-1.00, so I did this. Then (still in Windows Explorer) I got: opengl.dll not found (pop-up window) I have the file opengl32.dll, but I needed to search opengl.dll in the web. I was surprised by this, because the opengl.org tech support (www.opengl.org/developers/faqs/technical/mswindows.htm) says that: "Unless there's an absolutely compelling reason ... I really would suggest using opengl32.dll, and letting the old opengl.dll thing die. opengl.dll comes from the now totally unsupported OpenGL for Windows release of OpenGL for Microsoft Windows by SGI. We stopped supporting that release over two years -- like no one ever touches the code." Ok, I found opengl.dll in http://tigger.uic.edu/~jayvee/opengl/opengldlls.zip and placed it in the redbook_HS folder. Unfortunately, the examples did not run... a very weird window was opened and the expected program didn't appear. I restarted my computer then and, when I tryied to run the examples again, I got a illegal operation (HELLO caused a invalid page fault in module WINMM.DLL in 0167:bfdf6633) *** I remember I had this problem no.3 in HOpenGL-1.00 too, but I don't remember how I solved it... It seems to me it's related with opengl.dll/opengl32.dll. Suggestions? -- Andre