Bug#713062: [cluster3] please rebuild and possibly move to main
Your package build-depends on libmotif-dev. Motif 2.3.4 was recently released under LGPL and the openmotif package in non-free has been replaced by the motif package in main.
The libmotif4 binary package has now been split into libxm4, libmrm4 and libuil4 and your package should be rebuilt in order for shlibs to generate the correct dependencies.
If your package's dependency on (open)motif is the only reason it is in non-free, it should now be able to move into main.
Paul & Graham