  We prove that a group obtained as a quotient of the free product of finitely
many cubulable groups by a finite set of relators satisfying the classical
$C'(1/6)$--small cancellation condition is cubulable. This yields a new large
class of relatively hyperbolic groups that can be cubulated, and constitutes
the first instance of a cubulability theorem for relatively hyperbolic groups
which does not require any geometric assumption on the peripheral subgroups
besides their cubulability. We do this by constructing appropriate wallspace
structures for such groups, by combining walls of the free factors with walls
coming from the universal cover of an associated $2$-complex of groups.

Group Theory;Geometric Topology