[XeTeX] Polytonic greek and XeLaTeX

[Johannes Engel]

Hi, everyone listening here! :)

While trying to write a german text using some words in ancient greek I
ran into the following situation:
The attached document is compiled fine using DejaVu Serif as font, but
omits the Omikron with spiritus when compiled using Minion Pro.

Both of the fonts do contain the respective glyph: DejaVu Serif as a
composed one, whereas Minion Pro contains it as a prepared glyph.

How can I tell XeLaTeX resp. ICU to use these glyphs from MinionPro?

Greetings, Johannes
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