Italic/Bold Text Font Not Showing

[nagymusic]

When  Spectral
<https://fonts.google.com/specimen/Spectral?selection.family=Spectral>  
font is set as roman text font, the italics and bold are not showing; the
regular roman is.

The font works just fine on Linux machine, but not on Windows. In fact, I
used to be able to use Spectral font on an older Windows computer without
problems. Would anyone be willing to test this and offer advice?

Thank you!

\version "2.19.82"

\paper  {
  #(define fonts
    (make-pango-font-tree "Spectral"
                          "Nimbus Sans,Nimbus Sans L"
                          "Luxi Mono"
                          (/ staff-height pt 20)))
}

\relative c'{
  c1-\markup \italic {
    roman,
    \sans sans,
    \typewriter typewriter. }
}




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