Hi all,
I'am using the last version of Qt (4.7.3) on Ubuntu 10.04 machine. The pc has a intel i855GME graphics chipset. When configuring Qt via configure script I give it the option "-graphicssystem opengl" and "-opengl desktop". The configure script report the following lines:

Qt Code: 
  1. Build type:    linux-g++
  2. Architecture:  i386
  3. Platform notes:
  4.  
  5.             - Also available for Linux: linux-kcc linux-icc linux-cxx
  6.  
  7. Build .................. libs tools examples demos docs translations
  8. Configuration ..........  release shared dll largefile stl precompile_header mmx 3dnow sse sse2 sse3 ssse3 sse4_1 sse4_2 avx  minimal-config small-config medium-config large-config full-config accessibility opengl reduce_exports ipv6 clock-gettime clock-monotonic mremap getaddrinfo ipv6ifname getifaddrs inotify png freetype zlib nis iconv xshape xsync mitshm xkb xmlpatterns multimedia svg release
  9. Debug .................. no
  10. Qt 3 compatibility ..... no
  11. QtDBus module .......... no
  12. QtConcurrent code ...... yes
  13. QtGui module ........... yes
  14. QtScript module ........ no
  15. QtScriptTools module ... no
  16. QtXmlPatterns module ... yes
  17. Phonon module .......... no
  18. Multimedia module ...... auto
  19. SVG module ............. yes
  20. WebKit module .......... no
  21. Declarative module ..... no
  22. Declarative debugging ...yes
  23. Support for S60 ........ no
  24. Symbian DEF files ...... no
  25. STL support ............ yes
  26. PCH support ............ yes
  27. MMX/3DNOW/SSE/SSE2/SSE3. yes/yes/yes/yes/yes
  28. SSSE3/SSE4.1/SSE4.2..... yes/yes/yes
  29. AVX..................... yes
  30. Graphics System ........ opengl
  31. IPv6 support ........... yes
  32. IPv6 ifname support .... yes
  33. getaddrinfo support .... yes
  34. getifaddrs support ..... yes
  35. Accessibility .......... yes
  36. NIS support ............ yes
  37. CUPS support ........... no
  38. Iconv support .......... yes
  39. Glib support ........... no
  40. GStreamer support ...... no
  41. PulseAudio support ..... no
  42. Large File support ..... yes
  43. GIF support ............ plugin
  44. TIFF support ........... plugin (qt)
  45. JPEG support ........... plugin (qt)
  46. PNG support ............ yes (qt)
  47. MNG support ............ plugin (qt)
  48. zlib support ........... yes
  49. Session management ..... no
  50. OpenGL support ......... yes (Desktop OpenGL)
  51. OpenVG support ......... no
  52. NAS sound support ...... no
  53. XShape support ......... yes
  54. XVideo support ......... no
  55. XSync support .......... yes
  56. Xinerama support ....... no
  57. Xcursor support ........ no
  58. Xfixes support ......... no
  59. Xrandr support ......... no
  60. Xrender support ........ no
  61. Xi support ............. no
  62. MIT-SHM support ........ yes
  63. FontConfig support ..... no
  64. XKB Support ............ yes
  65. immodule support ....... yes
  66. GTK theme support ...... no
  67. OpenSSL support ........ no 
  68. Alsa support ........... no
  69. ICD support ............ no
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So I think that openGL support was enabled, but when I run some application the first line in the output is:
Qt Code: 
  1. Unable to load graphicssystem "opengl"
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Anyone have experience the same problem???