diff --git a/.github/workflows/actions-compile.yml b/.github/workflows/actions-compile.yml
index f3300b1..21a2c78 100644
--- a/.github/workflows/actions-compile.yml
+++ b/.github/workflows/actions-compile.yml
@@ -10,9 +10,11 @@ on:
 jobs:
   build-gtp-guard:
     name: Build gtp-guard
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ ubuntu-latest ]
+        arch: [x86_64, arm64]
         compiler: [ gcc, clang ]
     steps:
       - name: add missing packages
@@ -30,14 +32,19 @@ jobs:
       - name: Upload gtp-guard artifacts
         uses: actions/upload-artifact@v4
         with:
-          name : artifact-gtp-guard-${{ matrix.compiler }}
+          name : artifact-gtp-guard-${{ matrix.compiler }}-${{ matrix.arch }}
           path : |
             bin/gtp-guard
             src/bpf/*.bpf
+            bin/*.bpf
             test/
   build-gtping:
     name: Build gtping
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+        arch: [x86_64, arm64]
     needs: build-gtp-guard
     steps:
       - name: gtping from upstream
@@ -54,12 +61,17 @@ jobs:
       - name: Upload gtping artifacts
         uses: actions/upload-artifact@v4
         with:
-          name : artifact-gtping
+          name : artifact-gtping-${{ matrix.arch }}
           path : src/gtping
   test-using-gtping:
     name: gtp-guard test using gtping
     needs: build-gtping
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+        arch: [x86_64, arm64]
+        compiler: [ gcc, clang ]
     steps:
       - name: add missing packages
         uses: ConorMacBride/install-package@v1
@@ -89,17 +101,19 @@ jobs:
       - name: run the test
         shell: bash
         run : |
+          APATH="bin/artifact-gtp-guard-${{ matrix.compiler }}-${{ matrix.arch }}"
+          APING="bin/artifact-gtping-${{ matrix.arch }}"
           ls -R -la
-          chmod 755 bin/artifact-gtp-guard-gcc/bin/gtp-guard
-          chmod 755 bin/artifact-gtping/gtping
-          chmod 755 bin/artifact-gtp-guard-gcc/test/testenv.sh
-          chmod 755 bin/artifact-gtp-guard-gcc/test/gtpu-ping.py
-          sudo bin/artifact-gtp-guard-gcc/test/testenv.sh \
-            -i bin/artifact-gtping/gtping \
-            -u bin/artifact-gtp-guard-gcc/test/gtpu-ping.py \
-            -g bin/artifact-gtp-guard-gcc/bin/gtp-guard \
+          chmod 755 $APATH/bin/gtp-guard
+          chmod 755 $APING/gtping
+          chmod 755 $APATH/test/testenv.sh
+          chmod 755 $APATH/test/gtpu-ping.py
+          sudo $APATH/test/testenv.sh \
+            -i $APING/gtping \
+            -u $APATH/test/gtpu-ping.py \
+            -g $APATH/bin/gtp-guard \
             -c etc/gtp-guard.conf \
-            -f bin/artifact-gtp-guard-gcc/src/bpf/gtp_fwd.bpf \
-            -r bin/artifact-gtp-guard-gcc/src/bpf/gtp_route.bpf \
-            -m bin/artifact-gtp-guard-gcc/src/bpf/gtp_mirror.bpf \
+            -f $APATH/bin/gtp_fwd.bpf \
+            -r $APATH/bin/gtp_route.bpf \
+            -m $APATH/bin/gtp_mirror.bpf \
             -k no
diff --git a/Makefile b/Makefile
index 0203c0c..815c06c 100644
--- a/Makefile
+++ b/Makefile
@@ -25,10 +25,10 @@ VERSION := $(shell cat VERSION)
 TARBALL = $(EXEC)-$(VERSION).tar.xz
 TARFILES = AUTHOR VERSION LICENSE README.md bin src lib Makefile libbpf
 
-prefix = /usr/local
-exec_prefix = ${prefix}
-sbindir     = ${exec_prefix}/sbin
-sysconfdir  = ${prefix}/etc
+prefix ?= /usr/local
+exec_prefix ?= ${prefix}
+sbindir     ?= ${exec_prefix}/sbin
+sysconfdir  ?= ${prefix}/etc
 init_script = etc/init.d/gtp-guard.init
 conf_file   = etc/gtp-guard/gtp-guard.conf
 
@@ -66,7 +66,7 @@ uninstall:
 	rm -f $(sbindir)/$(EXEC)
 
 install:
-	install -d $(prefix)
+	install -d $(sbindir)
 	install -m 700 $(BIN)/$(EXEC) $(sbindir)/$(EXEC)-$(VERSION)
 	ln -sf $(sbindir)/$(EXEC)-$(VERSION) $(sbindir)/$(EXEC)
 
diff --git a/src/bpf/Makefile b/src/bpf/Makefile
index 24c453f..dadf4e7 100644
--- a/src/bpf/Makefile
+++ b/src/bpf/Makefile
@@ -47,6 +47,7 @@ clean:
 dependencies: verify_cmds verify_target_bpf
 verify_cmds: $(CLANG) $(LLC)
 	@for TOOL in $^ ; do \
+		which $${TOOL} ;\
 		if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
 			echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
 			exit 1; \
diff --git a/tools/selftests/resolv-naptr/test-resolv b/tools/selftests/resolv-naptr/test-resolv
deleted file mode 100755
index 131def9..0000000
Binary files a/tools/selftests/resolv-naptr/test-resolv and /dev/null differ