diff --git a/CMakeLists.txt b/CMakeLists.txt
index c011425..46e13d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,10 +41,8 @@ include (CheckIncludeFileCXX)
 check_include_file_cxx (attr/xattr.h HAVE_ATTR_XATTR_H)
 check_include_file_cxx (sys/xattr.h HAVE_SYS_XATTR_H)
 
+# Look for old pre-C++11 headers.
 check_include_file_cxx (tr1/memory HAVE_TR1_MEMORY)
-check_include_file_cxx (tr1/unordered_map HAVE_TR1_UNORDERED_MAP)
-check_include_file_cxx (tr1/unordered_set HAVE_TR1_UNORDERED_SET)
-check_include_file_cxx (tr1/tuple HAVE_TR1_TUPLE)
 
 # Check if xattr functions take extra arguments, as they do on OSX.
 # Output error is misleading, so do this test quietly.
diff --git a/config.h.cmake b/config.h.cmake
index c182452..2cf6227 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -5,9 +5,6 @@
 #cmakedefine XATTR_ADD_OPT
 
 #cmakedefine HAVE_TR1_MEMORY
-#cmakedefine HAVE_TR1_UNORDERED_MAP
-#cmakedefine HAVE_TR1_UNORDERED_SET
-#cmakedefine HAVE_TR1_TUPLE
 
 #cmakedefine HAVE_LCHMOD