Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -194,7 +194,7 @@
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND TSAN_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Linux")
+    OS_NAME MATCHES "Linux|FreeBSD")
   set(COMPILER_RT_HAS_TSAN TRUE)
 else()
   set(COMPILER_RT_HAS_TSAN FALSE)
Index: test/tsan/lit.cfg
===================================================================
--- test/tsan/lit.cfg
+++ test/tsan/lit.cfg
@@ -62,6 +62,6 @@
 # Default test suffixes.
 config.suffixes = ['.c', '.cc', '.cpp']
 
-# ThreadSanitizer tests are currently supported on Linux only.
-if config.host_os not in ['Linux']:
+# ThreadSanitizer tests are currently supported on FreeBSD and Linux only.
+if config.host_os not in ['FreeBSD', 'Linux']:
   config.unsupported = True