Hello,
the dclunidac10.lpk package installs perfectly the first time and is usable. But once installed, it is impossible for me to rebuild Lazarus 1.9.0 (trunk).
I am obliged to delete components/UniDac and to reinstall dclunidac10.lpk.
UniDAC supports only Lazarus 1.6.4 and Free Pascal 3.0.2. Support for Lazarus older versions will be added only after the release of the corresponding stable versions of this product