Soumya says that the reason why fribidi is in the SDK is to satisfy build dependency for slang, but it won't be in the device.

This will probably not be the only case where a package is in SDK to satisfy build dependency and not on the device. The device does not need such packages. The SDK has quite a many tools which are not in the device (check the meta package maemo-tools).

We are looking for a solution, feel free opening a new thread if you want to discuss further. In the meantime the specific problem with FBReader is clear: there is a missing dependency with libfribidi0 that needs to be solved. Maybe uploading it to extras-devel is the simplest solution now.