问CMake教程第4步安装示例未按预期工作

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(base) xxx@xxx-ThinkPad-T470p: $ cmake ../Step4 -DUSE_MYMATH=ON
-- Configuring done
-- Generating done
-- Build files have been written to: /home/xxx/work/CMake_examples/cmake-3.24.1-tutorial-source/Step4_build
(base) xxx@xxx-ThinkPad-T470p: $ cmake --build .
[ 50%] Built target MathFunctions
[100%] Built target Tutorial
(base) xxx@xxx-ThinkPad-T470p: $ cmake --install . --prefix /tmp/testinstall
CMake Error: The source directory "/tmp/testinstall" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.

add_library(MathFunctions mysqrt.cxx)

# state that anybody linking to us needs to include the current source dir
# to find MathFunctions.h, while we don't.
target_include_directories(MathFunctions
          INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
          )

install(TARGETS MathFunctions DESTINATION lib)
install(FILES MathFunctions.h DESTINATION include)

cmake_minimum_required(VERSION 3.10)

# set the project name and version
project(Tutorial VERSION 1.0)

# specify the C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

# should we use our own math functions
option(USE_MYMATH "Use tutorial provided math implementation" ON)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file(TutorialConfig.h.in TutorialConfig.h)

# add the MathFunctions library
if(USE_MYMATH)
  add_subdirectory(MathFunctions)
  list(APPEND EXTRA_LIBS MathFunctions)
endif()

# add the executable
add_executable(Tutorial tutorial.cxx)

target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS})

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial PUBLIC
                           "${PROJECT_BINARY_DIR}"
                           )

install(TARGETS Tutorial DESTINATION bin)
install(FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
  DESTINATION include
  )                           

(base) xxx@xxx-ThinkPad-T470p: $ cmake --version
cmake version 3.10.2