godep in makefile

Makefile

@@ -6,12 +6,15 @@ BUILD_FLAGS := -ldflags "-X main.git_date=$(GIT_DATE) -X main.git_hash=$(GIT_HAS
 PLATFORMS := linux/amd64 linux/386 linux/arm darwin/amd64 windows/amd64 windows/386 openbsd/amd64
 SOURCES := $(shell find . -maxdepth 1 -type f -name "*.go")
 ALL_SOURCES = $(shell find . -type f -name '*.go' -not -path "./vendor/*")
+DEP_EXISTS := $(shell command -v dep 2> /dev/null)
 
 temp = $(subst /, ,$@)
 os = $(word 1, $(temp))
 arch = $(word 2, $(temp))
 ext = $(shell if [ "$(os)" = "windows" ]; then echo ".exe"; fi)
 
+.PHONY: all release fmt clean serv dep godep $(PLATFORMS)
+
 all: certgraph
 
 release: $(PLATFORMS)
@@ -24,8 +27,13 @@ $(PLATFORMS): $(SOURCES)
 	CGO_ENABLED=0 GOOS=$(os) GOARCH=$(arch) go build $(BUILD_FLAGS) -o 'build/bin/$(os)/$(arch)/certgraph$(ext)' $(SOURCES)
 	mkdir -p build/$(GIT_DATE)/; cd build/bin/$(os)/$(arch)/; zip -r ../../../$(GIT_DATE)/certgraph-$(os)-$(arch)-$(GIT_DATE).zip .; cd ../../../
 
-dep:
-	dep ensure
+dep: godep
+	dep ensure -v
+
+godep:
+ifndef DEP_EXISTS
+	go get -u github.com/golang/dep/cmd/dep 
+endif
 
 fmt:
 	gofmt -s -w -l .
@@ -35,5 +43,3 @@ clean:
 
 serv:
 	(cd docs; python -m SimpleHTTPServer)
-
-.PHONY: all fmt clean release serv dep $(PLATFORMS)