求教一个apt-get 安装软件问题

adding gd ...
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gd
adding libaio-dev ...
Reading package lists... Done
Building dependency tree
Reading state information... Done
libaio-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Cannot find /usr/include/openssl/ssl.h.
Did you run the pre-install commands?
http://help.directadmin.com/item.php?id=354

已经看过她给的页面，也装了，没报错，可是还是装不上da，debian 7 x64 求教这个问题