--- libserial-1.0.0/CMakeLists.txt
+++ libserial-1.0.0/CMakeLists.txt
@@ -16,6 +16,7 @@ PROJECT(LibSerial LANGUAGES C CXX VERSIO
 #
 OPTION(INSTALL_STATIC "Install static library." ON)
 OPTION(INSTALL_SHARED "Install shared object library." ON)
+OPTION(LIBSERIAL_ENABLE_TESTING "Build the unit tests, downloads googletest." ON)
 
 INCLUDE(ExternalProject)
 
@@ -102,6 +103,7 @@ macro(USE_CXX14)
 endmacro(USE_CXX14)
 USE_CXX14()
 
+IF (LIBSERIAL_ENABLE_TESTING)
 SET(GTEST_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/gtest")
 
 EXTERNALPROJECT_ADD(GTestExternal
@@ -136,9 +138,9 @@ ADD_DEPENDENCIES(GTest GTestExternal)
 ADD_DEPENDENCIES(GTestMain GTestExternal)
 
 EXTERNALPROJECT_GET_PROPERTY(GTestExternal source_dir)
+ENDIF ()
 
 INCLUDE_DIRECTORIES(
-  BEFORE ${GTEST_PREFIX}/src/GTestExternal/googletest/include
   ${Boost_INCLUDE_DIRS}
   )
 
@@ -150,7 +152,10 @@ SET(CMAKE_INSTALL_MESSAGE ALWAYS)
 ADD_SUBDIRECTORY(examples)
 ADD_SUBDIRECTORY(sip)
 ADD_SUBDIRECTORY(src)
-ADD_SUBDIRECTORY(test)
+IF (LIBSERIAL_ENABLE_TESTING)
+  INCLUDE_DIRECTORIES(BEFORE ${GTEST_PREFIX}/src/GTestExternal/googletest/include)
+  ADD_SUBDIRECTORY(test)
+ENDIF ()
 
 CONFIGURE_FILE(
   ${CMAKE_CURRENT_SOURCE_DIR}/doxygen.conf.in