While trying to compile the lesson 6 from nehe I got this linker errors. Here the linker parameters:

-lmingw32 -lSDLmain -lSDL -lopengl32 -lglu32 -lglaux

[Linker error] undefined reference to `_imp__wglCreateContext@4' 
[Linker error] undefined reference to `_imp__wglMakeCurrent@8' 
[Linker error] undefined reference to `_imp__wglMakeCurrent@8' 
[Linker error] undefined reference to `_imp__wglDeleteContext@4' 
ld returned 1 exit status 
D:\Carlos\C\opengl\nehe\6\Makefile.win [Build Error]  [1.exe] Error 1

Problem solved, just link the -lglaux before -lopengl32.