wrong FontFaces url when using dawn

Hi folks,

I tried to reduce the size of our war by replacing the maven dependency “com.vaadin.vaadin-themes” with “org.peimari.dawn:6”.

The problem is that, when I compile the theme the styles.css contains following entry:

@font-face {
font-family: FontAwesome;
font-weight: normal;
font-style: normal;
src: url(../valo/util/bourbon/css3/http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/fonts/fontawesome-webfont.eot);
src: url(../valo/util/bourbon/css3/http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/fonts/fontawesome-webfont.eot?#iefix)
  format("embedded-opentype"),
url(../valo/util/bourbon/css3/http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/fonts/fontawesome-webfont.woff)
  format("woff"),
url(../valo/util/bourbon/css3/http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/fonts/fontawesome-webfont.ttf)
  format("truetype"),
url(../valo/util/bourbon/css3/http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/fonts/fontawesome-webfont.svg#FontAwesome)
  format("svg");
}

When I manually edit the file, everything works fine.
So what am I missing to compile the theme correctly?