O.K. here is the output, thanks for your help.


/ $ apt-cache showpkg python2.5-sip4
Package: python2.5-sip4
Versions:
4.11-maemo0 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages) (/var/lib/dpkg/status)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565

4.10.5-maemo0 (/var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages) (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565

4.10.3-maemo0 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565

4.10.0 (/var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages) (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565

4.10-maemo20091123.0 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565

4.7.7-maemo3 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: 20a381f9808ac99b9989902b3ed7d565


Reverse Depends:
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-qt4-common,python2.5-sip4 4.10
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-qt4-common,python2.5-sip4 4.10
python2.5-qt4-common,python2.5-sip4 4.10
python2.5-qt4-common,python2.5-sip4 4.7.7
python2.5-qt4-common,python2.5-sip4 4.7.7
python2.5-sip4-dev,python2.5-sip4 4.7.7-maemo3
python2.5-sip4-dev,python2.5-sip4 4.10-maemo20091123.0
python2.5-sip4-dev,python2.5-sip4 4.10.3-maemo0
python2.5-sip4-dev,python2.5-sip4 4.11-maemo0
python2.5-qt4-common,python2.5-sip4 4.10.0
python2.5-sip4-dev,python2.5-sip4 4.10.0
python2.5-sip4-dev,python2.5-sip4 4.10.5-maemo0
Dependencies:
4.11-maemo0 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
4.10.5-maemo0 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
4.10.3-maemo0 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
4.10.0 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
4.10-maemo20091123.0 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
4.7.7-maemo3 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1) sip (0 (null))
Provides:
4.11-maemo0 -
4.10.5-maemo0 -
4.10.3-maemo0 -
4.10.0 -
4.10-maemo20091123.0 -
4.7.7-maemo3 -
Reverse Provides:
/ $ apt-cache showpkg sip
Package: sip
Versions:
4.7.7-maemo2 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: 504f0ebbeeeacad59fcb3a1c9bbfd0c0


Reverse Depends:
sip-dev,sip 4.7.7-maemo2
python2.5-sip4,sip
sip4,sip
sip4,sip
python2.5-sip4,sip
sip4,sip
sip4,sip
python2.5-sip4,sip
python2.5-sip4,sip
python2.5-sip4,sip
sip4,sip
python2.5-sip4,sip
sip4,sip
Dependencies:
4.7.7-maemo2 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libstdc++6 (2 3.4.4) python2.5 (2 2.5.1)
Provides:
4.7.7-maemo2 -
Reverse Provides:
/ $ apt-cache showpkg python2.5-qt4-gui
Package: python2.5-qt4-gui
Versions:
4.7-maemo7 (/var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages) (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages) (/var/lib/dpkg/status)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras_dists_diablo_free_bina ry-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo6 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo5 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo4 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo3 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo2 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.7-maemo1 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.6.2-maemo20091218.1 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.6.2-maemo20091123.2 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.4.3-maemo10 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602

4.4.3-maemo7 (/var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages)
Description Language:
File: /var/lib/apt/lists/repository.maemo.org_extras-devel_dists_diablo_free_binary-armel_Packages
MD5: aa51f921e22a2e42fd2582d29aff4602


Reverse Depends:
autocompleteeditor,python2.5-qt4-gui
ankiqt,python2.5-qt4-gui
dialcentral,python2.5-qt4-gui
dialcentral,python2.5-qt4-gui
radiotimetogo,python2.5-qt4-gui
radiotimetogo,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui 4.7-maemo7
python2.5-qt4-doc,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui
python2.5-qt4-doc,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyconverter-gui-qt,python2.5-qt4-gui
pyconverter-gui-qt,python2.5-qt4-gui
pyconverter-gui-qt,python2.5-qt4-gui
pyqtoreader,python2.5-qt4-gui
pyqtoreader,python2.5-qt4-gui 4.4
pyqtoreader,python2.5-qt4-gui 4.4
pyqtoreader,python2.5-qt4-gui 4.4
pyqtoreader,python2.5-qt4-gui 4.4
ejpi,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
wikipediadumpreader,python2.5-qt4-gui
python2.5-qt4,python2.5-qt4-gui 4.7-maemo1
python2.5-qt4,python2.5-qt4-gui 4.7-maemo5
python2.5-qt4,python2.5-qt4-gui 4.7-maemo4
python2.5-qt4,python2.5-qt4-gui 4.7-maemo6
python2.5-qt4,python2.5-qt4-gui 4.6.2-maemo20091123.2
python2.5-qt4,python2.5-qt4-gui 4.7-maemo2
python2.5-qt4,python2.5-qt4-gui 4.6.2-maemo20091218.1
python2.5-qt4,python2.5-qt4-gui 4.4.3-maemo10
python2.5-qt4,python2.5-qt4-gui 4.4.3-maemo7
python2.5-qt4,python2.5-qt4-gui 4.7-maemo3
python2.5-qt4,python2.5-qt4-gui 4.7-maemo7
lighttpd-dav-gui,python2.5-qt4-gui
ankiqt,python2.5-qt4-gui
ankiqt,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
pyradio,python2.5-qt4-gui
ejpi,python2.5-qt4-gui
gonvert,python2.5-qt4-gui
Dependencies:
4.7-maemo7 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqtgui4 (16 (null)) libqt4-gui (2 4.5.3~git20090723) python2.5-qt4-core (5 4.7-maemo7)
4.7-maemo6 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqtgui4 (16 (null)) libqt4-gui (2 4.5.3~git20090723) python2.5-qt4-core (5 4.7-maemo6)
4.7-maemo5 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqtgui4 (16 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.3~git20090723) python2.5-qt4-core (5 4.7-maemo5)
4.7-maemo4 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.7-maemo4)
4.7-maemo3 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.7-maemo3)
4.7-maemo2 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.7-maemo2)
4.7-maemo1 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.7-maemo1)
4.6.2-maemo20091218.1 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.6.2-maemo20091218.1)
4.6.2-maemo20091123.2 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqt4-maemo5-gui (16 (null)) libqt4-gui (2 4.5.0) python2.5-qt4-core (5 4.6.2-maemo20091123.2)
4.4.3-maemo10 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.5.0) libqtgui4 (2 4.5.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqtgui4 (2 4.4.1) python2.5-qt4-core (5 4.4.3-maemo10)
4.4.3-maemo7 - libc6 (2 2.5.0-1) libgcc1 (2 1:3.4.4) libqtcore4 (2 4.4.0) libqtgui4 (2 4.4.0) libstdc++6 (2 3.4.4) libx11-6 (0 (null)) libxext6 (0 (null)) libqtgui4 (2 4.4.1) python2.5-qt4-core (5 4.4.3-maemo7)
Provides:
4.7-maemo7 -
4.7-maemo6 -
4.7-maemo5 -
4.7-maemo4 -
4.7-maemo3 -
4.7-maemo2 -
4.7-maemo1 -
4.6.2-maemo20091218.1 -
4.6.2-maemo20091123.2 -
4.4.3-maemo10 -
4.4.3-maemo7 -
Reverse Provides:
/ $