diff --git a/Makefile b/Makefile
index 3f5cd84..a2cb5af 100644
--- a/Makefile
+++ b/Makefile
@@ -13,72 +13,72 @@ check:  ## Check
 BUILD_FAIL_PATTERN=grep -v "exec format error" | grep "build failed" && exit 1 || exit 0
 build_test:  ## test only buildable
 	# Supported operating systems
-	GOOS=linux GOARCH=amd64 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=386 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=arm go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=arm64 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=loong64 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=riscv64 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=linux GOARCH=s390x go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=freebsd GOARCH=amd64 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=freebsd GOARCH=386 go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=freebsd GOARCH=arm go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=freebsd GOARCH=arm64 go test ./... | $(BUILD_FAIL_PATTERN)
-	CGO_ENABLED=0 GOOS=darwin go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=windows go test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=amd64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=386 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=arm go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=arm64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=loong64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=riscv64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=linux GOARCH=s390x go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=freebsd GOARCH=amd64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=freebsd GOARCH=386 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=freebsd GOARCH=arm go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=freebsd GOARCH=arm64 go120 test ./... | $(BUILD_FAIL_PATTERN)
+	CGO_ENABLED=0 GOOS=darwin go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=windows go120 test ./... | $(BUILD_FAIL_PATTERN)
 	# Operating systems supported for building only (not implemented error if used)
-	GOOS=solaris go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=dragonfly go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=netbsd go test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=solaris go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=dragonfly go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=netbsd go120 test ./... | $(BUILD_FAIL_PATTERN)
 	# cross build to OpenBSD not worked since process has "C"
-#	GOOS=openbsd go test ./... | $(BUILD_FAIL_PATTERN)
-	GOOS=plan9 go test ./... | $(BUILD_FAIL_PATTERN)
+#	GOOS=openbsd go120 test ./... | $(BUILD_FAIL_PATTERN)
+	GOOS=plan9 go120 test ./... | $(BUILD_FAIL_PATTERN)
 
 ifeq ($(shell uname -s), Darwin)
-	CGO_ENABLED=1 GOOS=darwin go test ./... | $(BUILD_FAIL_PATTERN)
+	CGO_ENABLED=1 GOOS=darwin go120 test ./... | $(BUILD_FAIL_PATTERN)
 endif
 	@echo 'Successfully built on all known operating systems'
 
 vet:
-	GOOS=darwin GOARCH=amd64 go vet ./...
-	GOOS=darwin GOARCH=arm64 go vet ./...
+	GOOS=darwin GOARCH=amd64 go120 vet ./...
+	GOOS=darwin GOARCH=arm64 go120 vet ./...
 
-	GOOS=dragonfly GOARCH=amd64 go vet ./...
+	GOOS=dragonfly GOARCH=amd64 go120 vet ./...
 
-	GOOS=freebsd GOARCH=amd64 go vet ./...
-	GOOS=freebsd GOARCH=386 go vet ./...
-	GOOS=freebsd GOARCH=arm go vet ./...
+	GOOS=freebsd GOARCH=amd64 go120 vet ./...
+	GOOS=freebsd GOARCH=386 go120 vet ./...
+	GOOS=freebsd GOARCH=arm go120 vet ./...
 
-	GOOS=linux GOARCH=386 go vet ./...
-	GOOS=linux GOARCH=amd64 go vet ./...
-	GOOS=linux GOARCH=arm64 go vet ./...
-	GOOS=linux GOARCH=arm go vet ./...
-	GOOS=linux GOARCH=loong64 go vet ./...
-	GOOS=linux GOARCH=mips64 go vet ./...
-	GOOS=linux GOARCH=mips64le go vet ./...
-	GOOS=linux GOARCH=mips go vet ./...
-	GOOS=linux GOARCH=mipsle go vet ./...
-	GOOS=linux GOARCH=ppc64le go vet ./...
-	GOOS=linux GOARCH=ppc64 go vet ./...
-	GOOS=linux GOARCH=riscv64 go vet ./...
-	GOOS=linux GOARCH=s390x go vet ./...
+	GOOS=linux GOARCH=386 go120 vet ./...
+	GOOS=linux GOARCH=amd64 go120 vet ./...
+	GOOS=linux GOARCH=arm64 go120 vet ./...
+	GOOS=linux GOARCH=arm go120 vet ./...
+	GOOS=linux GOARCH=loong64 go120 vet ./...
+	GOOS=linux GOARCH=mips64 go120 vet ./...
+	GOOS=linux GOARCH=mips64le go120 vet ./...
+	GOOS=linux GOARCH=mips go120 vet ./...
+	GOOS=linux GOARCH=mipsle go120 vet ./...
+	GOOS=linux GOARCH=ppc64le go120 vet ./...
+	GOOS=linux GOARCH=ppc64 go120 vet ./...
+	GOOS=linux GOARCH=riscv64 go120 vet ./...
+	GOOS=linux GOARCH=s390x go120 vet ./...
 
-	GOOS=netbsd GOARCH=amd64 go vet ./...
+	GOOS=netbsd GOARCH=amd64 go120 vet ./...
 
-	GOOS=openbsd GOARCH=386 go vet ./...
-	GOOS=openbsd GOARCH=amd64 go vet ./...
+	GOOS=openbsd GOARCH=386 go120 vet ./...
+	GOOS=openbsd GOARCH=amd64 go120 vet ./...
 
-	GOOS=solaris GOARCH=amd64 go vet ./...
+	GOOS=solaris GOARCH=amd64 go120 vet ./...
 
-	GOOS=windows GOARCH=amd64 go vet ./...
-	GOOS=windows GOARCH=386 go vet ./...
+	GOOS=windows GOARCH=amd64 go120 vet ./...
+	GOOS=windows GOARCH=386 go120 vet ./...
 
-	GOOS=plan9 GOARCH=amd64 go vet ./...
-	GOOS=plan9 GOARCH=386 go vet ./...
+	GOOS=plan9 GOARCH=amd64 go120 vet ./...
+	GOOS=plan9 GOARCH=386 go120 vet ./...
 
 macos_test:
-	CGO_ENABLED=0 GOOS=darwin go test ./... | $(BUILD_FAIL_PATTERN)
-	CGO_ENABLED=1 GOOS=darwin go test ./... | $(BUILD_FAIL_PATTERN)
+	CGO_ENABLED=0 GOOS=darwin go120 test ./... | $(BUILD_FAIL_PATTERN)
+	CGO_ENABLED=1 GOOS=darwin go120 test ./... | $(BUILD_FAIL_PATTERN)
 
 init_tools:
 	go get github.com/golang/dep/cmd/dep
diff --git a/cpu/cpu_netbsd_amd64.go b/cpu/cpu_netbsd_amd64.go
new file mode 100644
index 0000000..57e1452
--- /dev/null
+++ b/cpu/cpu_netbsd_amd64.go
@@ -0,0 +1,9 @@
+package cpu
+
+type cpuTimes struct {
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Intr uint64
+	Idle uint64
+}
diff --git a/disk/disk_netbsd_amd64.go b/disk/disk_netbsd_amd64.go
new file mode 100644
index 0000000..c21421c
--- /dev/null
+++ b/disk/disk_netbsd_amd64.go
@@ -0,0 +1,45 @@
+//go:build netbsd && amd64
+// +build netbsd,amd64
+
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go
+
+package disk
+
+const (
+	sizeOfStatvfs = 0xce0
+)
+
+type (
+	Statvfs struct {
+		Flag         uint64
+		Bsize        uint64
+		Frsize       uint64
+		Iosize       uint64
+		Blocks       uint64
+		Bfree        uint64
+		Bavail       uint64
+		Bresvd       uint64
+		Files        uint64
+		Ffree        uint64
+		Favail       uint64
+		Fresvd       uint64
+		Syncreads    uint64
+		Syncwrites   uint64
+		Asyncreads   uint64
+		Asyncwrites  uint64
+		Fsidx        _Ctype_struct___0
+		Fsid         uint64
+		Namemax      uint64
+		Owner        uint32
+		Spare        [4]uint64
+		Fstypename   [32]uint8
+		Mntonname    [1024]uint8
+		Mntfromname  [1024]uint8
+		Mntfromlabel [1024]uint8
+	}
+)
+
+type _Ctype_struct___0 struct {
+	FsidVal [2]int32
+}
diff --git a/mem/mem_bsd.go b/mem/mem_bsd.go
index ce930fb..ef867d7 100644
--- a/mem/mem_bsd.go
+++ b/mem/mem_bsd.go
@@ -1,5 +1,5 @@
-//go:build freebsd || openbsd
-// +build freebsd openbsd
+//go:build freebsd || openbsd || netbsd
+// +build freebsd openbsd netbsd
 
 package mem