-\font_roman Linux Libertine O
-\font_sans Linux Biolinum O
-\font_typewriter Linux Biolinum O
-\font_math auto
+\font_roman "default" "Linux Libertine O"
+\font_sans "default" "Linux Biolinum O"
+\font_typewriter "default" "Linux Biolinum O"
+\font_math "auto" "auto"