[HOpenGL] problem with displayCallback and Double buffering

does anyone else have this problem? i want to use double buffering, but swapBuffers does not seem to work. to set the active window to... the active window (i think that has to work!) does not work, too. but i am able to compile and run glut examples with double buffering written in c. coeus@titan ~/Documents/haskell/hopengl/problem $ ghc -package GLUT -package OpenGL first.hs -lglut coeus@titan ~/Documents/haskell/hopengl/problem $ ./a.out displayModePossible? ...True begin swapBuffers