SUBDIRS = ffmpeg .PHONY: all clean distclean all: @for dir in $(SUBDIRS); do \ $(MAKE) -C "$$dir" all; \ done clean: @for dir in $(SUBDIRS); do \ $(MAKE) -C "$$dir" clean; \ done distclean: @for dir in $(SUBDIRS); do \ $(MAKE) -C "$$dir" distclean; \ done