$ su -c "aptitude install libssl-dev"
Password:
Reading package lists... Done
Building dependency tree... Done
Reading extended state information
Initializing package states... Done
Writing extended state information... Done
Reading task descriptions... Done
Building tag database... Done
The following packages are BROKEN:
libssl-dev
The following packages are unused and will be REMOVED:
aalib1 akode artsbuilder bug-buddy cdrecord dbus-glib-1 docbook-dsssl dselect eog esound file-roller gcalctool gconf-editor gedit gedit-common
gnome-core gnome-doc-tools gnome-nettool gnome-system-tools gnome-utils gnome2-user-guide gnomemeeting gpdf gtk2-engines-crux
gtk2-engines-lighthouseblue gtk2-engines-mist gtk2-engines-redmond95 gtk2-engines-thinice gucharmap kview libcompfaceg1 libcupsys2-gnutls10
libdb1-compat libdns16 libdps1 libebook8 libecal6 libedataserver3 libeel2-2 libexif10 libfam0c102 libgimpprint1 libgsf-1 libgtkhtml2-0
libhal-storage0 libisc7 libiw27 liblwres1 libnautilus-burn0 libnet1 libnetpbm10 libnewt0.51 liboggflac1 liboil0.2 libreadline4 libsamplerate0
libsnmp5 libsoup2.2-7 libssl0.9.7 libwnck4 mkisofs netpbm openjade pm-dev secpolicy slang1a-utf8 synaptic tcptraceroute tidy totem totem-xine vino
xlibmesa-dri xmms
The following packages have been kept back:
evolution kdebase libggi2 libnss-mdns mailutils python-twisted
0 packages upgraded, 1 newly installed, 74 to remove and 6 not upgraded.
Need to get 2087kB of archives. After unpacking 115MB will be freed.
The following packages have unmet dependencies:
libssl-dev: Depends: libssl0.9.8 (= 0.9.8c-4) but 0.9.8e-4 is installed.
Resolving dependencies...
The following actions will resolve these dependencies:
Downgrade the following packages:
libssl0.9.8 [0.9.8e-4 (now) -> 0.9.8c-4 (stable)]
openssl [0.9.8e-4 (now) -> 0.9.8c-4 (stable)]
Score is -70
Accept this solution? [Y/n/q/?]