TELY_FILES = $(shell ls $(depth)/Documentation/user/lilypond*.tely)
TELY_FILES += $(foreach l, $(LANGS), $(shell ls $(depth)/Documentation/$(l)/user/lilypond*.tely))
TELY_FILES = $(shell ls $(depth)/Documentation/user/lilypond*.tely)
TELY_FILES += $(foreach l, $(LANGS), $(shell ls $(depth)/Documentation/$(l)/user/lilypond*.tely))