shared libraries support in gdc and gdc compilation

[eles]

Just tested with the gdc-4.8 branch:

-> gdc -O0 -g "main.d"    -o 
"/home/e_ftotir/monodevelop-workspace/dtest/bin/Debug/dtest"
Error: cannot find source code for runtime library file 'object.d'
        dmd might not be correctly installed. Run 'dmd -man' for 
installation instructions.


Do you have any idea while gdc will spit out an error message 
asking me to run... dmd?


And how to correct this?