Index: lib/Support/Unix/Path.inc
===================================================================
--- lib/Support/Unix/Path.inc
+++ lib/Support/Unix/Path.inc
@@ -371,6 +371,9 @@
 #elif defined(__Fuchsia__)
   // Fuchsia doesn't yet support remote filesystem mounts.
   return true;
+#elif defined(__HAIKU__)
+  // Haiku doesn't expose this information.
+  return false;
 #elif defined(__sun)
   // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
   StringRef fstype(Vfs.f_basetype);