fix build

Makefile

@@ -1,7 +1,24 @@
-all:
+VERSION = $(shell git describe --tags)
-	go build -v -x
+BUILDTIME = $(shell date +%Y.%m.%d)
+
+all: build
 	./control-panel-vpn
 
+build:
+	GO111MODULE=off go build \
+		-ldflags "-X main.VERSION=${VERSION} -X main.BUILDTIME=${BUILDTIME} -X gui.GUIVERSION=${VERSION}"
+
+verbose:
+	GO111MODULE=off go build -v -x \
+		-ldflags "-X main.VERSION=${VERSION} -X main.BUILDTIME=${BUILDTIME} -X gui.GUIVERSION=${VERSION}"
+
+install:
+	GO111MODULE=off go install \
+		-ldflags "-X main.VERSION=${VERSION} -X main.BUILDTIME=${BUILDTIME} -X gui.GUIVERSION=${VERSION}"
+
+clean:
+	-rm -f control-panel-vpn
+
 goimports:
 	goimports -w *.go