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if(BUILD_TESTING AND GMX_BUILD_UNITTESTS)
    # GTest/GMock suggest linking with pthreads when available for thread safety
    set(CMAKE_THREAD_PREFER_PTHREAD 1)
    find_package(Threads)
    set(PTHREADS_LIBRARIES)
    if (CMAKE_USE_PTHREADS_INIT)
        set(PTHREADS_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
        # Input to googletest CMake scripts
        set(GTEST_HAS_PTHREAD 1)
        # Output for consumption in GROMACS build tree
        set(GTEST_IS_THREADSAFE 1)
    else()
        # Input to googletest CMake scripts
        set(GTEST_HAS_PTHREAD 0)
        # Output for consumption in GROMACS build tree
        set(GTEST_IS_THREADSAFE 0)
    endif()

    add_subdirectory(googletest EXCLUDE_FROM_ALL)
    target_compile_definitions(gmock
        PRIVATE
            _GNU_SOURCE=1
            GTEST_CAN_STREAM_RESULTS=0
        PUBLIC
            GTEST_LANG_CXX11
            )
    target_compile_definitions(gtest PUBLIC GTEST_LANG_CXX11)
    if (CYGWIN)
        # Ensure GoogleTest and things that use it can find
        # POSIX things needed by GoogleTest
        target_compile_definitions(gtest PUBLIC _POSIX_C_SOURCE=200809L)
    endif()
    gmx_target_warning_suppression(gmock -Wno-deprecated-copy HAVE_NO_DEPRECATED_COPY)

    set(GTEST_IS_THREADSAFE "${GTEST_IS_THREADSAFE}" PARENT_SCOPE)
endif()
add_subdirectory(boost)
