PangoFontDescription *pfd = properties_to_pango_description (chain, scm_to_double (size));
char *str = pango_font_description_to_string (pfd);
PangoFontDescription *pfd = properties_to_pango_description (chain, scm_to_double (size));
char *str = pango_font_description_to_string (pfd);