--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,8 +72,9 @@
     include_directories("${gtest_SOURCE_DIR}/include")
 
 elseif (BUILD_TESTS AND USE_SYSTEM_GTEST)
-	enable_testing()
-	add_subdirectory(/usr/src/googletest ${GLOBAL_OUTPUT_PATH}/googletest-build)
+    enable_testing()
+    find_package(GTest REQUIRED)
+    include_directories(${GTEST_INCLUDE_DIR})
 endif()
 
 # Compiler flags.