nick@konrad:/home/developer/sta-travel $ sudo pear upgrade pear
downloading PEAR-1.5.0.tgz ...
Starting to download PEAR-1.5.0.tgz (286,143 bytes)
...........................................................done: 286,143 bytes
requires package `Structures_Graph' >= 1.0.2
PEAR: Dependencies failed

nick@konrad:/home/developer/sta-travel $ sudo pear upgrade structures_graph
downloading Structures_Graph-1.0.2.tgz ...
Starting to download Structures_Graph-1.0.2.tgz (30,422 bytes)
.........done: 30,422 bytes
No handlers for package.xml version 2.0