Digital-Den:~#  aptitude install mplayer=version-in-lenny
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
Reading task descriptions... Done  
Building tag database... Done    
Unable to find a version "version-in-lenny" for the package "mplayer"
The following packages are BROKEN:
  mplayer 
The following packages are unused and will be REMOVED:
  libnetfilter-queue1 libnfnetlink0 
The following packages have been automatically kept back:
  gnome-themes gnome-user-guide hpijs-ppds hplip-data imagemagick iso-codes 
  libcaca0 libcucul0 libfaac0 libfaad0 libfuse2 libgnomevfs2-0 
  libgnomevfs2-bin libgnomevfs2-common libgnomevfs2-extra libgphoto2-2 
  libgphoto2-port0 libmozjs0d libneon26 libnspr4-0d libperl5.8 libraw1394-8 
  libtheora0 libwpd8c2a libxul-common libxul0d openssl xserver-xorg-core 
  xulrunner-gnome-support 
The following NEW packages will be automatically installed:
  libxcomposite1 
The following packages have been kept back:
  console-common cpp-4.2 fuse-utils gcc-4.2-base gzip hpijs hplip less 
  libffi4 libgcc1 libkrb53 libmagick9 libncurses5 libncursesw5 
  libservlet2.4-java libssl0.9.8 libstdc++6 man-db ncurses-base ncurses-bin 
  ncurses-term perl perl-base perl-modules python-dbus tzdata w32codecs 
The following NEW packages will be installed:
  libxcomposite1 
The following packages will be upgraded:
  libartsc0 
1 packages upgraded, 2 newly installed, 2 to remove and 56 not upgraded.
Need to get 4821kB of archives. After unpacking 10.5MB will be used.
The following packages have unmet dependencies:
  mplayer: Depends: libgtk2.0-0 (>= 2.12.0) but 2.10.13-1 is installed.
Resolving dependencies...
The following actions will resolve these dependencies:

Keep the following packages at their current version:
mplayer [Not Installed]

Score is -9879

Accept this solution? [Y/n/q/?] y
The following packages are unused and will be REMOVED:
  libartsc0 libggi2 libgii1 libgii1-target-x libnetfilter-queue1 
  libnfnetlink0 libopenal0a libungif4g mplayer-skin-blue 
The following packages have been automatically kept back:
  gnome-themes gnome-user-guide hpijs-ppds hplip-data imagemagick iso-codes 
  libcaca0 libcucul0 libfaac0 libfaad0 libfuse2 libgnomevfs2-0 
  libgnomevfs2-bin libgnomevfs2-common libgnomevfs2-extra libgphoto2-2 
  libgphoto2-port0 libmozjs0d libneon26 libnspr4-0d libperl5.8 libraw1394-8 
  libtheora0 libwpd8c2a libxul-common libxul0d openssl xserver-xorg-core 
  xulrunner-gnome-support 
The following packages have been kept back:
  console-common cpp-4.2 fuse-utils gcc-4.2-base gzip hpijs hplip less 
  libffi4 libgcc1 libkrb53 libmagick9 libncurses5 libncursesw5 
  libservlet2.4-java libssl0.9.8 libstdc++6 man-db ncurses-base ncurses-bin 
  ncurses-term perl perl-base perl-modules python-dbus tzdata w32codecs 
0 packages upgraded, 0 newly installed, 9 to remove and 56 not upgraded.
Need to get 0B of archives. After unpacking 3146kB will be freed.
Do you want to continue? [Y/n/?]