DESTDIR ?=
JAR_DIR ?= /usr/share/java

ANT = ant
FAIL = exit 1
FIND = find
INSTALL = install
RM = rm -f

dep_dir = $1 $(shell $(FIND) $1 2>/dev/null)

all: PHONY build/aopalliance.jar

build/aopalliance.jar: $(call dep_dir,src)
	$(ANT) || { $(RM) -r $(@D); $(FAIL); }

install: PHONY $(DESTDIR)$(JAR_DIR)/aopalliance.jar

$(DESTDIR)$(JAR_DIR)/%.jar: build/%.jar
	$(INSTALL) -Dm644 $< $@

clean: PHONY
	$(RM) -r build

.PHONY: PHONY
.DELETE_ON_ERROR:
.SECONDARY: