android dependency for libraries

Hi.

I have 3 projects :
- "A", android library, using liba.jar
- "B", android library, using library "A"
- "C", main android application, using library "B" (and so, indirectly, "A").

The problem is that the jar used by librairie A have to be declared in librairie B and projet C.
Do I miss something ?
On Eclipse, there no need to do this. Jars used by "A" are automaticlly imported in "C".

Thanks for your help.

Mike