diff --git a/Makefile b/Makefile
index b6c9e906c..bf4e91998 100644
--- a/Makefile
+++ b/Makefile
@@ -14,11 +14,13 @@
 # limitations under the License.
 
 # Use bash, so that we can do process substitution.
-SHELL = /bin/bash
+SHELL := $(shell which bash)
 
 # Go tools.
 GO ?= go
 GO_MD2MAN ?= go-md2man
+GOOS ?= $(shell go env GOOS)
+GOARCH ?= $(shell go env GOARCH)
 export GO111MODULE=on
 
 # Set up the ... lovely ... GOPATH hacks.
@@ -68,13 +70,19 @@ BASE_FLAGS := ${BUILD_FLAGS} -tags "${BUILDTAGS}"
 BASE_LDFLAGS := -s -w -X ${PROJECT}.gitCommit=${COMMIT} -X ${PROJECT}.version=${VERSION}
 
 # Specific build flags for build type.
-DYN_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS}"
-TEST_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+ifeq ($(GOOS), linux)
+  DYN_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS}"
+  TEST_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+else
+  DYN_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS}"
+  TEST_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+endif
+
 STATIC_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS} -extldflags '-static'"
 
 # Installation directories.
 DESTDIR ?=
-PREFIX ?=/usr
+PREFIX ?=/usr/local
 BINDIR ?=$(PREFIX)/bin
 MANDIR ?=$(PREFIX)/share/man
 
@@ -85,7 +93,7 @@ GO_SRC = $(shell find . -type f -name '*.go')
 # NOTE: If you change these make sure you also update local-validate-build.
 
 umoci: $(GO_SRC)
-	$(GO) build ${DYN_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}
+	GOOS=$(GOOS) GOARCH=$(GOARCH) $(GO) build ${DYN_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}
 
 umoci.static: $(GO_SRC)
 	env CGO_ENABLED=0 $(GO) build ${STATIC_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}
diff --git a/pkg/fseval/fseval_default.go b/pkg/fseval/fseval_default.go
index 1cb03f51c..994d86dac 100644
--- a/pkg/fseval/fseval_default.go
+++ b/pkg/fseval/fseval_default.go
@@ -103,11 +103,6 @@ func (fs osFsEval) RemoveAll(path string) error {
 	return os.RemoveAll(path)
 }
 
-// Mknod is equivalent to unix.Mknod.
-func (fs osFsEval) Mknod(path string, mode os.FileMode, dev uint64) error {
-	return unix.Mknod(path, uint32(mode), int(dev))
-}
-
 // MkdirAll is equivalent to os.MkdirAll.
 func (fs osFsEval) MkdirAll(path string, perm os.FileMode) error {
 	return os.MkdirAll(path, perm)
diff --git a/pkg/fseval/mknod_freebsd.go b/pkg/fseval/mknod_freebsd.go
new file mode 100644
index 000000000..51d44e9e4
--- /dev/null
+++ b/pkg/fseval/mknod_freebsd.go
@@ -0,0 +1,28 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package fseval
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func (fs osFsEval) Mknod(path string, mode os.FileMode, dev uint64) error {
+       return unix.Mknod(path, uint32(mode), uint64(dev))
+}
diff --git a/pkg/fseval/mknod_linux.go b/pkg/fseval/mknod_linux.go
new file mode 100644
index 000000000..33a5a5ea2
--- /dev/null
+++ b/pkg/fseval/mknod_linux.go
@@ -0,0 +1,28 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package fseval
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func (fs osFsEval) Mknod(path string, mode os.FileMode, dev uint64) error {
+       return unix.Mknod(path, uint32(mode), int(dev))
+}
diff --git a/pkg/unpriv/mknod_freebsd.go b/pkg/unpriv/mknod_freebsd.go
new file mode 100644
index 000000000..383860463
--- /dev/null
+++ b/pkg/unpriv/mknod_freebsd.go
@@ -0,0 +1,34 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package unpriv
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+// Mknod is a wrapper around unix.Mknod which has been wrapped with unpriv.Wrap
+// to make it possible to remove a path even if you do not currently have the
+// required access bits to modify or resolve the path.
+func Mknod(path string, mode os.FileMode, dev uint64) error {
+	return errors.Wrap(Wrap(path, func(path string) error {
+		return unix.Mknod(path, uint32(mode), uint64(dev))
+	}), "unpriv.mknod")
+}
diff --git a/pkg/unpriv/mknod_linux.go b/pkg/unpriv/mknod_linux.go
new file mode 100644
index 000000000..696f20f20
--- /dev/null
+++ b/pkg/unpriv/mknod_linux.go
@@ -0,0 +1,34 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package unpriv
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+// Mknod is a wrapper around unix.Mknod which has been wrapped with unpriv.Wrap
+// to make it possible to remove a path even if you do not currently have the
+// required access bits to modify or resolve the path.
+func Mknod(path string, mode os.FileMode, dev uint64) error {
+	return errors.Wrap(Wrap(path, func(path string) error {
+		return unix.Mknod(path, uint32(mode), int(dev))
+	}), "unpriv.mknod")
+}
diff --git a/pkg/unpriv/unpriv.go b/pkg/unpriv/unpriv.go
index 45614f0b6..055e63689 100644
--- a/pkg/unpriv/unpriv.go
+++ b/pkg/unpriv/unpriv.go
@@ -446,15 +446,6 @@ func MkdirAll(path string, perm os.FileMode) error {
 	}), "unpriv.mkdirall")
 }
 
-// Mknod is a wrapper around unix.Mknod which has been wrapped with unpriv.Wrap
-// to make it possible to remove a path even if you do not currently have the
-// required access bits to modify or resolve the path.
-func Mknod(path string, mode os.FileMode, dev uint64) error {
-	return errors.Wrap(Wrap(path, func(path string) error {
-		return unix.Mknod(path, uint32(mode), int(dev))
-	}), "unpriv.mknod")
-}
-
 // Llistxattr is a wrapper around system.Llistxattr which has been wrapped with
 // unpriv.Wrap to make it possible to remove a path even if you do not
 // currently have the required access bits to resolve the path.