Compiling wxd on Linux with Tango (0.98 RC2) results in the following error:
>dmd -version=__WXGTK__ -version=UNICODE -I.. -O -g -c -ofLog.o Log.d
>Log.d(23): module Vararg cannot read file 'tango/Core/Vararg.d'
>make[1]: *** [Log.o] Error 1
It looks like the: import tango.Core.Vararg; on line 23 should be: import tango.core.Vararg; with a lower case "c".
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Yup, perils of developing with a case-insenstive filesystem like HFS+ on Mac OS X :-P
Fixed in CVS, thanks for reporting.