diff --git a/external/llvh/lib/Support/Signals.cpp b/external/llvh/lib/Support/Signals.cpp
index 0e1a32ca006..afe5470f1aa 100644
--- a/external/llvh/lib/Support/Signals.cpp
+++ b/external/llvh/lib/Support/Signals.cpp
@@ -103,7 +103,7 @@ static FormattedNumber format_ptr(void *PC) {
 }
 
 /// Helper that launches llvm-symbolizer and symbolizes a backtrace.
-LLVM_ATTRIBUTE_USED
+[[maybe_unused]]
 static bool printSymbolizedStackTrace(StringRef Argv0, void **StackTrace,
                                       int Depth, llvh::raw_ostream &OS) {
   if (DisableSymbolicationFlag)
diff --git a/external/llvh/lib/Support/raw_ostream.cpp b/external/llvh/lib/Support/raw_ostream.cpp
index 1406fd97ad9..509150ed82b 100644
--- a/external/llvh/lib/Support/raw_ostream.cpp
+++ b/external/llvh/lib/Support/raw_ostream.cpp
@@ -764,7 +764,7 @@ size_t raw_fd_ostream::preferred_buffer_size() const {
   if (IsWindowsConsole)
     return 0;
   return raw_ostream::preferred_buffer_size();
-#elif !defined(__minix)
+#elif !defined(__minix) && !(defined(__APPLE__) && defined(HERMES_IS_MOBILE_BUILD))
   // Minix has no st_blksize.
   assert(FD >= 0 && "File not yet open!");
   struct stat statbuf;