Index: llvm/trunk/lib/Fuzzer/test/CMakeLists.txt
===================================================================
--- llvm/trunk/lib/Fuzzer/test/CMakeLists.txt
+++ llvm/trunk/lib/Fuzzer/test/CMakeLists.txt
@@ -126,7 +126,17 @@
 ###############################################################################
 
 include_directories(..)
-add_subdirectory(dfsan)
+
+if(APPLE)
+  message(WARNING "Dataflow sanitizer is not supported on Apple platforms."
+    " Building and running LibFuzzer dataflow sanitizer tests is disabled."
+    )
+  set(HAS_DFSAN 0)
+else()
+  set(HAS_DFSAN 1)
+  add_subdirectory(dfsan)
+endif()
+
 add_subdirectory(uninstrumented)
 add_subdirectory(ubsan)
 add_subdirectory(trace-bb)
Index: llvm/trunk/lib/Fuzzer/test/fuzzer-dfsan.test
===================================================================
--- llvm/trunk/lib/Fuzzer/test/fuzzer-dfsan.test
+++ llvm/trunk/lib/Fuzzer/test/fuzzer-dfsan.test
@@ -1,3 +1,4 @@
+REQUIRES: dfsan
 CHECK1: BINGO
 CHECK2: BINGO
 CHECK3: BINGO
Index: llvm/trunk/lib/Fuzzer/test/lit.cfg
===================================================================
--- llvm/trunk/lib/Fuzzer/test/lit.cfg
+++ llvm/trunk/lib/Fuzzer/test/lit.cfg
@@ -13,3 +13,9 @@
                              config.environment['PATH']))
 config.environment['PATH'] = path
 
+if config.has_dfsan:
+  lit_config.note('dfsan feature available')
+  config.available_features.add('dfsan')
+else:
+  lit_config.note('dfsan feature unavailable')
+
Index: llvm/trunk/lib/Fuzzer/test/lit.site.cfg.in
===================================================================
--- llvm/trunk/lib/Fuzzer/test/lit.site.cfg.in
+++ llvm/trunk/lib/Fuzzer/test/lit.site.cfg.in
@@ -1,3 +1,4 @@
 config.test_exec_root = "@CMAKE_CURRENT_BINARY_DIR@"
 config.llvm_tools_dir = "@LLVM_TOOLS_DIR@"
+config.has_dfsan = True if @HAS_DFSAN@ == 1 else False
 lit_config.load_config(config, "@CMAKE_CURRENT_SOURCE_DIR@/lit.cfg")