Getting Help
ros-users mailing list (archive) - user contact point for problems.
eros-dev mailing list - contact point for live developer discussions.
eros forums - working area, jots and most things unofficial.
issue tracker - search/file bugs/todos and feature requests.
Common Problems
Undefined Reference
It's probably trying to link to native libraries, not your cross-compiled libraries. This can happen if your CMAKE_FIND_ROOT_PATH is not set correctly to point to your toolchain header/lib root and as a result, it falls back to a search through the native header/lib directories, finds the native lib and then spits the dummy.
If you've created a custom cmake toolchain module, check that its finding the libraries. For more information, see UserDefinedToolchains.