diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..354722e
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,34 @@
+github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/google/goexpect v0.0.0-20191001010744-5b6988669ffa h1:PMkmJA8ju9DjqAJjIzrBdrmhuuPsoNnNLYgKQBopWL0=
+github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f h1:5CjVwnuUcp5adK4gmY6i72gpVFVnZDP2h5TmPScB6u4=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
+github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
+github.com/klauspost/compress v1.10.6 h1:SP6zavvTG3YjOosWePXFDlExpKIWMTO4SE/Y8MZB2vI=
+github.com/klauspost/compress v1.10.6/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/pgzip v1.2.4 h1:TQ7CNpYKovDOmqzRHKxJh0BeaBI7UdQZYc6p7pMQh1A=
+github.com/klauspost/pgzip v1.2.4/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQKQE9RUs=
+github.com/pierrec/lz4/v4 v4.1.11 h1:LVs17FAZJFOjgmJXl9Tf13WfLUvZq7/RjfEJrnwZ9OE=
+github.com/pierrec/lz4/v4 v4.1.11/go.mod h1:gZWDp/Ze/IJXGXf23ltt2EXimqmTUXEy0GFuRQyBid4=
+github.com/u-root/u-root v0.8.0 h1:jqP7uPC2+0eRszYTrmdZ6UDyO1Dbuy0rpMo+BnPZ9cY=
+github.com/u-root/u-root v0.8.0/go.mod h1:But1FHzS4Ua4ywx6kZOaRzZTucUKIDKOPOLEKOckQ68=
+github.com/ulikunitz/xz v0.5.8 h1:ERv8V6GKqVi23rgu5cj9pVfVzJbOqAY2Ntl88O6c2nQ=
+github.com/ulikunitz/xz v0.5.8/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
+github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54 h1:8mhqcHPqTMhSPoslhGYihEgSfc77+7La1P6kiB6+9So=
+github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54/go.mod h1:twkDnbuQxJYemMlGd4JFIcuhgX83tXhKS2B/PRMpOho=
+github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f h1:p4VB7kIXpOQvVn1ZaTIVp+3vuYAXFe3OJEvjbUYJLaA=
+github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+github.com/whilp/git-urls v1.0.0 h1:95f6UMWN5FKW71ECsXRUd3FVYiXdrE7aX4NZKcPmIjU=
+github.com/whilp/git-urls v1.0.0/go.mod h1:J16SAmobsqc3Qcy98brfl5f5+e0clUvg1krgwk/qCfE=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
+golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
+golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200728102440-3e129f6d46b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210820121016-41cdb8703e55 h1:rw6UNGRMfarCepjI8qOepea/SXwIBVfTKjztZ5gBbq4=
+golang.org/x/sys v0.0.0-20210820121016-41cdb8703e55/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/tools v0.1.1 h1:wGiQel/hW0NnEkJUk8lbzkX2gFJU6PFxf1v5OlCfuOs=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+google.golang.org/grpc v1.29.1 h1:EC2SB8S04d2r73uptxphDSUG+kTKVgjRPF+N3xpxRB4=
diff --git a/main.go b/main.go
index 9771de5..cd40997 100644
--- a/main.go
+++ b/main.go
@@ -334,19 +334,6 @@ func main() {
 		log.Printf("getgo errored, %v, keep going", err)
 	}
 
-	// Some things need GOOS and GOARCH awareness in surprising ways. Modules are once such.
-	for _, kern := range kernels {
-		for _, arch := range archs {
-			bin = filepath.Join(fmt.Sprintf("%v_%v", kern, arch), "bin")
-			if err := os.MkdirAll(filepath.Join(d, bin), 0755); err != nil {
-				log.Fatal(err)
-			}
-
-			if err := buildToolchain(d, kern, arch); err != nil {
-				log.Fatal(err)
-			}
-		}
-	}
 	if err := os.MkdirAll(filepath.Join(d, "src"), 0755); err != nil {
 		log.Fatal(err)
 	}
@@ -354,17 +341,28 @@ func main() {
 		log.Fatalf("Getting packages: %v", err)
 	}
 
-	if err := files(d, bin, filepath.Join(d, bin)); err != nil {
-		log.Fatal(err)
-	}
-
 	baseToolPath := filepath.Join(d, bin)
 	if *development {
 		baseToolPath = pwd
 	}
-	V("Build tools from %q", baseToolPath)
+
+	// Some things need GOOS and GOARCH awareness in surprising ways. Modules are once such.
 	for _, kern := range kernels {
 		for _, arch := range archs {
+			bin = filepath.Join(fmt.Sprintf("%v_%v", kern, arch), "bin")
+			if err := os.MkdirAll(filepath.Join(d, bin), 0755); err != nil {
+				log.Fatal(err)
+			}
+
+			if err := buildToolchain(d, kern, arch); err != nil {
+				log.Fatal(err)
+			}
+
+			if err := files(d, bin, filepath.Join(d, bin)); err != nil {
+				log.Fatal(err)
+			}
+
+			V("Build tools from %q", baseToolPath)
 			for _, tool := range []string{"installcommand", "init"} {
 				goBin := filepath.Join(d, bin, tool)
 				V("Build %q in %q, install to %q", tool, baseToolPath, goBin)
@@ -372,9 +370,9 @@ func main() {
 					log.Fatalf("Building %q -> %q: %v", goBin, tool, err)
 				}
 			}
-
 		}
 	}
+
 	if *outCPIO != "" {
 		if err := ramfs(d, *outCPIO); err != nil {
 			log.Printf("ramfs: %v", err)