I had the same problem until I set MONO_PATH to gtk-sharp and gecko-sharp directories:
export MONO_PATH=/usr/lib/mono/gtk-sharp:/usr/lib/mono/gecko-sharp (or wherever the libs are installed)
Well, doing "make install" as a root was simpler :) (As I figured out that once the assemblies are in GAC, everything works)
Uhh... How could Your solution help as the only place where the art-sharp.dll was present was the gtk-sharp build folder? (~/mono_1.0/gtk-sharp-1.0 in my case)
-- Gert
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