Try to look under Source\Property Editors or similar subdirectory of BCB,
that's where dsdesign.pas + .dfm is located with Delphi, and it's not in
Delphi library path by default.
HTH
TOndrej

> While building ibo 3.6 Ce test 3 (ibo_c5.bpk), the BCB5 compiler
> complains about 'cannot find DSDesign.dcu'