Problem with winebuild under cygwin

[Julien C]

I am trying to build Wine cvs under Cygwin and when trying to build dlls I get this error:   ../tools/winebuild/winebuild  -o advapi32/advapi32.spec.def --def advapi32/advapi32.spec Unable to create output file '(null)' make: *** [advapi32/advapi32.spec.def] Error 1     Does someone have any idea on how to fix that ?   Julien