Enable cmake tests with Clang too
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 257f6df..558aedf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,9 @@
 if(CMAKE_COMPILER_IS_GNUCC)
   add_subdirectory(tests)
 endif(CMAKE_COMPILER_IS_GNUCC)
+if(CMAKE_COMPILER_IS_CLANG)
+  add_subdirectory(tests)
+endif(CMAKE_COMPILER_IS_CLANG)
 
 add_subdirectory(programs)