关于cmakelists.txt文件编译出现notfound错误的解决办法?

tom@tom-virtual-machine:~/Documents/LTK_CPP_Linux_10_46_0/libltkcpp-linux/examples/docsample1/build$ cmake ..
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
LIBLTKCPP
    linked by target "docsample1" in directory /home/tom/Documents/LTK_CPP_Linux_10_46_0/libltkcpp-linux/examples/docsample1
LIBLTKCPP_IMPINJ
    linked by target "docsample1" in directory /home/tom/Documents/LTK_CPP_Linux_10_46_0/libltkcpp-linux/examples/docsample1

-- Configuring incomplete, errors occurred!
See also "/home/tom/Documents/LTK_CPP_Linux_10_46_0/libltkcpp-linux/examples/docsample1/build/CMakeFiles/CMakeOutputom@tom-virtual-machine:~/Documents/LTK_CPP_Linux_10_46_0/libltkcpp-linux/examples/docsample1/build$ 

上面的是报错结果。

cmake_minimum_required(VERSION 3.16)
project(docsample1)

find_library(LIBLTKCPP libltkcpp.a REQUIRED)
find_library(LIBLTKCPP_IMPINJ libltkcppimpinj.a REQUIRED)
# it is not recommended to statically link for ssl and crypto libraries
find_library(LIBSSL ssl REQUIRED)
find_library(LIBCRYPTO crypto REQUIRED)
# The ETK does not contain a host static library for xml2.  Add the generic
# name 'xml2' to link against the dynmaic library when compiling for host.
find_library(LIBXML2 NAMES libxml2.a xml2 REQUIRED)
set(LIBS
    ${LIBLTKCPP}
    ${LIBLTKCPP_IMPINJ}
    ${LIBCRYPTO}
    ${LIBSSL}
    ${LIBXML2}
)

add_executable(${PROJECT_NAME} ${PROJECT_NAME}.cpp)
target_link_libraries(${PROJECT_NAME} PRIVATE ${LIBS})

这是cmakelists.txt文件。

 

请问出错的可能原因及解决方法是什么?

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