diff --git a/libcxx/test/libcxx/transitive_includes.gen.py b/libcxx/test/libcxx/transitive_includes.gen.py
index 22fde8e72c3a2cc..c1f5b55a9a75cc5 100644
--- a/libcxx/test/libcxx/transitive_includes.gen.py
+++ b/libcxx/test/libcxx/transitive_includes.gen.py
@@ -91,7 +91,7 @@
 // RUN: %{{cxx}} %s %{{flags}} %{{compile_flags}} --trace-includes -fshow-skipped-includes --preprocess > /dev/null 2> %t/trace-includes.txt
 // RUN: %{{python}} %{{libcxx-dir}}/test/libcxx/transitive_includes/to_csv.py %t/trace-includes.txt > %t/actual_transitive_includes.csv
 // RUN: %{{python}} %{{libcxx-dir}}/test/libcxx/transitive_includes/expected.py %{{cxx_std}} "{header}" %t/expected_transitive_includes.csv
-// RUN: diff %t/expected_transitive_includes.csv %t/actual_transitive_includes.csv
+// RUN: %{{python}} %{{libcxx-dir}}/test/libcxx/transitive_includes/diff.py %t/expected_transitive_includes.csv %t/actual_transitive_includes.csv
 #include <{header}>
 """
         )
diff --git a/libcxx/test/libcxx/transitive_includes/diff.py b/libcxx/test/libcxx/transitive_includes/diff.py
new file mode 100755
index 000000000000000..c30a6a9841a31ba
--- /dev/null
+++ b/libcxx/test/libcxx/transitive_includes/diff.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+import argparse
+import os
+import sys
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="""Diff two files.""",
+    )
+    parser.add_argument("file1", default=None)
+    parser.add_argument("file2", default=None)
+    args = parser.parse_args()
+
+    def doread(f):
+        with open(f, 'r') as file:
+            content = file.read()
+        lines = [l.strip() for l in content.splitlines()]
+        return list(filter(None, lines))
+
+    content1 = doread(args.file1)
+    content2 = doread(args.file2)
+
+    for l1, l2 in zip(content1, content2):
+        if l1 != l2:
+            print("line not equal")
+            print(l1)
+            print(l2)
+            sys.exit(1)
diff --git a/libcxx/test/libcxx/transitive_includes/expected.py b/libcxx/test/libcxx/transitive_includes/expected.py
index 483cbf7e4d20bee..3fc0a728c41dc8a 100755
--- a/libcxx/test/libcxx/transitive_includes/expected.py
+++ b/libcxx/test/libcxx/transitive_includes/expected.py
@@ -2681,11 +2681,11 @@
         for line in files[args.standard].splitlines():
             # print(f"READING LINE: {line}")
             if line.startswith(args.header + ' '):
-                print(f"WRITING THIS TO OUTPUT: {line}\n")
+                # print(f"WRITING THIS TO OUTPUT: {line}\n")
                 output.write(line + '\n')
 
     with open(args.out, 'r') as output:
-        print("WRITTEN OUTPUT IS:")
+        # print("WRITTEN OUTPUT IS:")
         print(output.read())
 
     # CSV_ROOT = os.path.dirname(__file__)