MarsSeed [1] filed a deletion request for orocos-kdl-python2 [2]: Abandoned Python 2 bindings package, last updated 4 years ago.
Not needed by anything, and it is broken because its seemingly Qt3-related python2-sip package has not had any sources available for years. The latest version of this library is recommended to be used with Python 3. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/orocos-kdl-python2/
