diff --git a/compiler-rt/lib/scudo/standalone/memtag.h b/compiler-rt/lib/scudo/standalone/memtag.h
--- a/compiler-rt/lib/scudo/standalone/memtag.h
+++ b/compiler-rt/lib/scudo/standalone/memtag.h
@@ -52,6 +52,7 @@
 
 #if defined(__aarch64__)
 
+#if SCUDO_LINUX
 inline bool systemSupportsMemoryTagging() {
 #ifndef HWCAP2_MTE
 #define HWCAP2_MTE (1 << 18)
@@ -76,6 +77,10 @@
               prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0)) &
           PR_MTE_TCF_MASK) != PR_MTE_TCF_NONE;
 }
+#else
+inline bool systemSupportsMemoryTagging() { return false; }
+inline bool systemDetectsMemoryTagFaultsTestOnly() { return false; }
+#endif // SCUDO_LINUX
 
 inline void disableMemoryTagChecksTestOnly() {
   __asm__ __volatile__(".arch_extension mte; msr tco, #1");