D for Xcode 1.0b1 - error while linking

[luca]

 Hi Michel, can you help me?

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hellod1:0: Command /usr/bin/gdc failed with exit code 1
Tool:0: can't locate file for: -lgphobos
Tool:0: warning -L: directory name (/Developer/SDKs/MacOSX10.4u.sdk/usr/lib/gcc/darwin/default) does not exist

Thanks.

Luca.