Would this indicate it is installed :
sudo apt-get install build-essential gdb libwxgtk2.6-0 libwxgtk2.6-dev wx2.6-headers wx2.6-doc wx-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
build-essential is already the newest version.
gdb is already the newest version.
libwxgtk2.6-0 is already the newest version.
libwxgtk2.6-dev is already the newest version.
wx2.6-headers is already the newest version.
wx2.6-headers set to manually installed.
wx2.6-doc is already the newest version.
wx-common is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded