[R] PostScript/PDF graphics with another font

[Peter]

I am using the standard phonetic font "Doulos SIL" in a graph
(http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=DoulosSILfont)

This is an example:

windowsFonts(IPA="TT Doulos SIL")
barplot(c(1,2,3,4,5),names=c("\u{0251}","\u{0252}","\u{0253}","\u{0254}","\u{0255}"),family="IPA")

However, I am unable to make an eps or pdf file from this graph. I get the
following error message when trying to save as .eps:

Error: family 'IPA' not included in PostScript device
In addition: Warning messages:
1: font family not found in PostScript font database
[...]

And this when I try to save as .pdf:

Error: Invalid font type
In addition: Warning messages:
1: font family not found in PostScript font database
[...]

I have tried various applications of the functions postscript(),
postscriptFonts(), pdf(), but I only get error messages when I try to tell
it to make use of the Doulos SIL font. I've searched for answers in Nabble
and google as well, but haven't found a solution (at least not one I
understand).

I'm using R 2.11 for Windows.

Thank you
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