diff --git a/configure.ac b/configure.ac
index e93c882b8..d621dcaf0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -160,7 +160,7 @@ case "${is_clang}-${gcc_version}" in
      icc-1[[3-9]].*)
 	AC_MSG_RESULT([ok (ICC version ${gcc_version})])
 	;;
-     notclang-[[3-9]].*|notclang-[[1-9][0-9]]*)
+     notclang-[[3-9]]|notclang-[[3-9]].*|notclang-[[1-9][0-9]]*)
 	AC_MSG_RESULT([ok (${gcc_version})])
 	;;
      clang-2.9|clang-[[3-9]].*|clang-[[1-9][0-9]]*)
diff --git a/drd/tests/std_thread.cpp b/drd/tests/std_thread.cpp
index 9275c3abf..6af7455b5 100644
--- a/drd/tests/std_thread.cpp
+++ b/drd/tests/std_thread.cpp
@@ -21,6 +21,7 @@ int main(int argc, char** argv)
   return 0;
 }
 
+#if defined(__GNUC__) && __GNUC__ -0 < 6
 //
 // From libstdc++-v3/src/c++11/thread.cc
 //
@@ -65,3 +66,4 @@ namespace std
     }
   }
 }
+#endif
diff --git a/drd/tests/std_thread2.cpp b/drd/tests/std_thread2.cpp
index 9861c618f..7de4f9d86 100644
--- a/drd/tests/std_thread2.cpp
+++ b/drd/tests/std_thread2.cpp
@@ -26,6 +26,7 @@ int main(int argc, char** argv)
   return 0;
 }
 
+#if defined(__GNUC__) && __GNUC__ -0 < 6
 //
 // From libstdc++-v3/src/c++11/thread.cc
 //
@@ -70,3 +71,4 @@ namespace std
     }
   }
 }
+#endif