Thanks for suggestions Yiannis.
But I need to invoke the compiler directly. (I work on a project that converts some makefiles to C::B prj files).
But meanwhile I found under the Advanced Compiler Settings, under the others tab, have a field named:
Library prefix (e.g. lib):
which was set to "lib". I remove the specified string, and now I can build my lib correctly.
It's my fault, I guess C::B have a lots of goodies inside, just to know how to work with these.....
Anyway, C::B is the BEST IDE!!!
Thanx again