diff --git a/libc/src/.clang-tidy b/libc/src/.clang-tidy
new file mode 100644
--- /dev/null
+++ b/libc/src/.clang-tidy
@@ -0,0 +1,6 @@
+Checks: '-*,llvmlibc-*'
+HeaderFilterRegex: '.*'
+WarningsAsErrors: 'llvmlibc-*'
+CheckOptions:
+  - key:             llvmlibc-restrict-system-libc-headers.Includes
+    value:           '-*, linux/*, asm/unistd.h'
diff --git a/libc/src/math/round_redirector.cpp b/libc/src/math/round_redirector.cpp
--- a/libc/src/math/round_redirector.cpp
+++ b/libc/src/math/round_redirector.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// Include okay for this redirector.
+// NOLINTNEXTLINE(llvmlibc-restrict-system-libc-headers)
 #include <math.h>
 
 namespace __llvm_libc {