make: Version var not const

Makefile

@@ -1,8 +1,12 @@
 ARCH := darwin/amd64 linux/386 linux/amd64 windows/386 windows/amd64
 VERSION := $(shell git describe --always --dirty)
+LDFLAGS := -ldflags "-X main.version=${VERSION}"
 
-release:
-	gox -output 'build/{{.Dir}}.{{.OS}}.{{.Arch}}' -osarch "${ARCH}" -ldflags "-X main.version=${VERSION}"
+yajsv: *.go
+	go build ${LDFLAGS}
+
+release: *.go
+	gox -output 'build/{{.Dir}}.{{.OS}}.{{.Arch}}' -osarch "${ARCH}" ${LDFLAGS}
 
 clean:
-	rm -rf build
+	rm -rf build yajsv

main.go

@@ -17,11 +17,9 @@ import (
 	"github.com/xeipuuv/gojsonschema"
 )
 
-const (
+var (
 	version = "undefined"
-)
 
-var (
 	schemaFlag  = flag.String("s", "", "primary JSON schema to validate against, required")
 	quietFlag   = flag.Bool("q", false, "quiet, only print validation failures and errors")
 	versionFlag = flag.Bool("v", false, "print version and exit")