diff --git a/Makefile b/Makefile
index c507e0d..d630651 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,6 @@
 # Pin the default clang to a stable version.
 CLANG ?= clang
 STRIP ?= llvm-strip
-#CFLAGS := -O2 -g -Wall -Werror $(CFLAGS)
 CFLAGS := -O2 -Wall -Werror $(CFLAGS)
 
 # Get version from .git.
@@ -16,15 +15,15 @@ date=$(shell git log -1 --format="%cd" --date=short | sed s/-//g)
 count=$(shell git rev-list --count HEAD)
 commit=$(shell git rev-parse --short HEAD)
 ifeq ($(wildcard .git/.),)
-	version=unstable-0.nogit
+	VERSION ?= unstable-0.nogit
 else
-	version=unstable-$(date).r$(count).$(commit)
+	VERSION ?= unstable-$(date).r$(count).$(commit)
 endif
 
 .PHONY: ebpf dae
 
 dae: ebpf
-	go build -ldflags "-s -w -X github.com/v2rayA/dae/cmd.Version=$(version)" .
+	go build -ldflags "-s -w -X github.com/v2rayA/dae/cmd.Version=$(VERSION)" .
 
 # $BPF_CLANG is used in go:generate invocations.
 ebpf: export BPF_CLANG := $(CLANG)
diff --git a/component/control/bpf_utils.go b/component/control/bpf_utils.go
index 3f266a2..ad3a3ef 100644
--- a/component/control/bpf_utils.go
+++ b/component/control/bpf_utils.go
@@ -54,17 +54,6 @@ func cidrToBpfLpmKey(prefix netip.Prefix) _bpfLpmKey {
 	}
 }
 
-// A utility to convert the values to proper strings.
-func int8ToStr(arr []int8) string {
-	b := make([]byte, 0, len(arr))
-	for _, v := range arr {
-		if v == 0x00 {
-			break
-		}
-		b = append(b, byte(v))
-	}
-	return string(b)
-}
 func BatchUpdate(m *ebpf.Map, keys interface{}, values interface{}, opts *ebpf.BatchOptions) (n int, err error) {
 	var old bool
 	version, e := internal.KernelVersion()
diff --git a/component/control/kern/tproxy.c b/component/control/kern/tproxy.c
index 1926cda..2e94c71 100644
--- a/component/control/kern/tproxy.c
+++ b/component/control/kern/tproxy.c
@@ -966,7 +966,6 @@ int tproxy_ingress(struct __sk_buff *skb) {
     key_src.port = tcph->source;
     key_src.proto = l4_proto;
     __u8 outbound;
-    // No record. No DNS requests before.
     if (unlikely(tcp_state_syn)) {
       // New TCP connection.
       // bpf_printk("[%X]New Connection", bpf_ntohl(tcph->seq));