diff --git a/cmd/analyze/analyze_test.go b/cmd/analyze/analyze_test.go
index 7a2fecd..7b0390e 100644
--- a/cmd/analyze/analyze_test.go
+++ b/cmd/analyze/analyze_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/cache.go b/cmd/analyze/cache.go
index 872a8d5..1b19ea6 100644
--- a/cmd/analyze/cache.go
+++ b/cmd/analyze/cache.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/cleanable.go b/cmd/analyze/cleanable.go
index 4c80879..5a7f8c5 100644
--- a/cmd/analyze/cleanable.go
+++ b/cmd/analyze/cleanable.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/constants.go b/cmd/analyze/constants.go
index d400035..abb46d4 100644
--- a/cmd/analyze/constants.go
+++ b/cmd/analyze/constants.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import "time"
diff --git a/cmd/analyze/delete.go b/cmd/analyze/delete.go
index 11feaee..196d751 100644
--- a/cmd/analyze/delete.go
+++ b/cmd/analyze/delete.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/delete_test.go b/cmd/analyze/delete_test.go
index 8d89ae1..af95431 100644
--- a/cmd/analyze/delete_test.go
+++ b/cmd/analyze/delete_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/format.go b/cmd/analyze/format.go
index 371539b..26d589e 100644
--- a/cmd/analyze/format.go
+++ b/cmd/analyze/format.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/format_test.go b/cmd/analyze/format_test.go
index 65a8333..96241f3 100644
--- a/cmd/analyze/format_test.go
+++ b/cmd/analyze/format_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
@@ -20,7 +22,7 @@ func TestRuneWidth(t *testing.T) {
 		{"CJK ideograph", '語', 2},
 		{"Full-width number", '１', 2},
 		{"ASCII space", ' ', 1},
-		{"Tab", '\t', 1},
+		{"Tab", '	', 1},
 	}
 
 	for _, tt := range tests {
diff --git a/cmd/analyze/heap.go b/cmd/analyze/heap.go
index 0b4a5a5..919ad1a 100644
--- a/cmd/analyze/heap.go
+++ b/cmd/analyze/heap.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 // entryHeap is a min-heap of dirEntry used to keep Top N largest entries.
diff --git a/cmd/analyze/heap_test.go b/cmd/analyze/heap_test.go
index 77408fc..12a1341 100644
--- a/cmd/analyze/heap_test.go
+++ b/cmd/analyze/heap_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/main_stub.go b/cmd/analyze/main_stub.go
new file mode 100644
index 0000000..89bd0e0
--- /dev/null
+++ b/cmd/analyze/main_stub.go
@@ -0,0 +1,13 @@
+//go:build !darwin
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	fmt.Fprintln(os.Stderr, "analyze is only supported on macOS")
+	os.Exit(1)
+}
diff --git a/cmd/analyze/scanner.go b/cmd/analyze/scanner.go
index f22387b..eac8fda 100644
--- a/cmd/analyze/scanner.go
+++ b/cmd/analyze/scanner.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/scanner_test.go b/cmd/analyze/scanner_test.go
index 718d276..c5a7557 100644
--- a/cmd/analyze/scanner_test.go
+++ b/cmd/analyze/scanner_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (
diff --git a/cmd/analyze/test_helpers_test.go b/cmd/analyze/test_helpers_test.go
index 9490833..a84fe1a 100644
--- a/cmd/analyze/test_helpers_test.go
+++ b/cmd/analyze/test_helpers_test.go
@@ -1,3 +1,5 @@
+//go:build darwin
+
 package main
 
 import (