Parsing xkb in builds 1.4.3 and newer fails.
$ ./klfc --from-xkb "/usr/share/X11/xkb/symbols/us(basic)" --pkl PKL
klfc: parse fail in /usr/share/X11/xkb/symbols/us:2:21:
unexpected '{'
expecting '"'
Same command works just fine in builds 1.4.2 and older.