[XeTeX] Font Warning Font shape Vollkorn it undefined

[Pander]

Hi all,

I'm trying to use Vollkorn in regularm bold, italic and bold italic.
However, italic and bold italic are not recognised by XeLaTeX.

I'm using the following XeLaTeX test document:

\documentclass{article}
\usepackage{xltxtra}
\begin{document}
\fontspec{Vollkorn}
ABCD {\bfseries ABCD} {\itshape\bfseries ABCD} {\itshape ABCD}
\end{document}

LaTeX Font Warning: Font shape `EU1/Vollkorn(0)/m/it' undefined
(Font)              using `EU1/Vollkorn(0)/m/n' instead on input line 5.

With the following fonts installed:
  http://friedrichalthausen.de/Vollkorn-2.1.zip

How can I fix this when fontconfig is telling me the following:

$ fc-list |grep -i vollkorn
Vollkorn,Vollkorn Regular:style=Regular
Vollkorn,Vollkorn Bold Italic:style=Bold Italic,Regular
Vollkorn,Vollkorn Bold:style=Bold,Regular
Vollkorn,Vollkorn Italic:style=Italic,Regular

$ fc-cat |grep -i vollkorn
"Vollkorn-Bold.ttf" 0 "Vollkorn,Vollkorn
Bold:familylang=en,en:style=Bold,Regular:stylelang=en,en:fullname=Vollkorn
Bold:fullnamelang=en:slant=0:weight=200:width=100:foundry=unknown:index=0:outline=True:scalable=True:charset=
 |>^1!|>^1!P0oWQ |>^1!|>^1!|>^1!!!!%# !!71$      !!!)$ !2b&R   (1+e5)KG/~
!!#(E    9WIlj   !!#0GM>RAd#y#fx!!!!5!#P~3 !!!W5  !!#6I!!K?&       !!#GN  
 !^^7$   !!*y^    !!$F%   !!+u{!!!!F      
:lang=aa|ast|ay|bi|br|ch|da|de|en|es|eu|fj|fo|fur|fy|gd|gl|gv|ho|ia|id|ie|io|is|it|lb|mg|nb|nds|nl|nn|no|nr|oc|om|pt|rm|sma|smj|so|sq|ss|st|sv|sw|tl|ts|uz|vo|wa|xh|yap|zu|an|fil|ht|jv|kj|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za:fontversion=131138:capability=otlayout\\:latn:fontformat=TrueType:decorative=False"
"Vollkorn-BoldItalic.ttf" 0 "Vollkorn,Vollkorn Bold
Italic:familylang=en,en:style=Bold
Italic,Regular:stylelang=en,en:fullname=Vollkorn Bold
Italic:fullnamelang=en:slant=100:weight=200:width=100:foundry=unknown:index=0:outline=True:scalable=True:charset=
 |>^1!|>^1!P0oWQ |>^0~|>^1!|>^1!!!!%# !!71$      !!!)$ !2b&R   (1+e5)KG/~
!!!.%     (1+e5  !!#(E    9WIlj   !!#0GM>RAd#y#fx!!!!5!#P~3 !!!W5 
!!#6I!!K?&       !!+u{!!!!F      
:lang=aa|ast|ay|bi|br|ch|da|de|en|es|eu|fj|fo|fur|fy|gd|gl|gv|ho|ia|id|ie|io|is|it|lb|mg|nb|nds|nl|nn|no|nr|oc|om|pt|rm|sma|smj|so|sq|ss|st|sv|sw|tl|ts|uz|vo|wa|xh|yap|zu|an|fil|ht|jv|kj|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za:fontversion=131138:capability=otlayout\\:latn:fontformat=TrueType:decorative=False"
"Vollkorn-Italic.ttf" 0 "Vollkorn,Vollkorn
Italic:familylang=en,en:style=Italic,Regular:stylelang=en,en:fullname=Vollkorn
Italic:fullnamelang=en:slant=100:weight=80:width=100:foundry=unknown:index=0:outline=True:scalable=True:charset=
 |>^1!|>^1!P0oWQ |>^0~|>^1!|>^1!!!!%# !!71$      !!!)$ !2b&R   (1+e5)KG/~
!!!.%     (1+e5  !!#(E    9WIlj   !!#0GM>RAd#y#fx!!!!5!#P~3 !!!W5 
!!#6I!!K?&       !!+u{!!!!F      
:lang=aa|ast|ay|bi|br|ch|da|de|en|es|eu|fj|fo|fur|fy|gd|gl|gv|ho|ia|id|ie|io|is|it|lb|mg|nb|nds|nl|nn|no|nr|oc|om|pt|rm|sma|smj|so|sq|ss|st|sv|sw|tl|ts|uz|vo|wa|xh|yap|zu|an|fil|ht|jv|kj|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za:fontversion=131138:capability=otlayout\\:latn:fontformat=TrueType:decorative=False"
"Vollkorn-Regular.ttf" 0 "Vollkorn,Vollkorn
Regular:familylang=en,en:style=Regular:stylelang=en:fullname=Vollkorn
Regular:fullnamelang=en:slant=0:weight=80:width=100:foundry=unknown:index=0:outline=True:scalable=True:charset=
 |>^1!|>^1!P0oWQ |>^1!|>^1!|>^1!!!!%# !!71$      !!!)$ !2b&R   (1+e5)KG/~
!!#(E    9WIlj   !!#0GM>RAd#y#fx!!!!5!#P~3 !!!W5  !!#6I!!K?&       !!#GN  
 !^^7$   !!*y^    !!$F%   !!+u{!!!!F      
:lang=aa|ast|ay|bi|br|ch|da|de|en|es|eu|fj|fo|fur|fy|gd|gl|gv|ho|ia|id|ie|io|is|it|lb|mg|nb|nds|nl|nn|no|nr|oc|om|pt|rm|sma|smj|so|sq|ss|st|sv|sw|tl|ts|uz|vo|wa|xh|yap|zu|an|fil|ht|jv|kj|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za:fontversion=131138:capability=otlayout\\:latn:fontformat=TrueType:decorative=False"