gistfile1.txt

[root@dev-aje:~]# apt-cache --help | grep -- depends
   depends - Show raw dependency information for a package
   rdepends - Show reverse dependency information for a package
[root@dev-aje:~]# apt-cache depends libpng12-0
libpng12-0
  Depends: libc6
  Depends: zlib1g
  PreDepends: multiarch-support
  Conflicts: libpng12-dev
  Conflicts: <mzscheme>
  Conflicts: pngcrush
  Conflicts: pngmeta
  Conflicts: <povray-3.5>
  Conflicts: <qemacs>
  Replaces: libpng12-dev
[root@dev-aje:~]# apt-cache depends libpng12-dev
libpng12-dev
  Depends: libpng12-0
  Depends: zlib1g-dev
  Conflicts: <libpng-dev>
  Conflicts: <libpng12-0-dev>
  Conflicts: <libpng2>
  Conflicts: <libpng2-dev>
  Replaces: <libpng12-0-dev>
    libpng12-dev
  Replaces: <libpng3-dev>