+const kern_pair *ps_std_font_kerns(char const *fontname);
+
+/*
+ * Functions exported from bk_pdf.c
+ */
+typedef struct object_Tag object;
+typedef struct objlist_Tag objlist;
+object *new_object(objlist *list);
+void objtext(object *o, char const *text);
+void objstream(object *o, char const *text);
+void objstream_len(object *o, char const *text, size_t len);
+char *pdf_outline_convert(wchar_t *s, int *len);
+
+/*
+ * Function exported from bk_ps.c
+ */
+void ps_token(FILE *fp, int *cc, char const *fmt, ...);
+
+/*
+ * Backend functions exported by in_pf.c
+ */
+void pf_part1(font_info *fi, char **bufp, size_t *lenp);
+void pf_part2(font_info *fi, char **bufp, size_t *lenp);
+void pf_writeps(font_info const *fi, FILE *ofp);
+
+/*
+ * Backend functions exported by in_sfnt.c
+ */
+typedef struct sfnt_Tag sfnt;
+glyph sfnt_indextoglyph(sfnt *sf, unsigned idx);
+unsigned sfnt_glyphtoindex(sfnt *sf, glyph g);
+unsigned sfnt_nglyphs(sfnt *sf);
+void sfnt_writeps(font_info const *fi, FILE *ofp);
+void sfnt_data(font_info *fi, char **bufp, size_t *lenp);