Cmake to link OpenSSL getting error `cannot find -l1` [duplicate]

I am trying the asio c14 ssl client example.

Giving the following CMakeLists.txt

cmake_minimum_required(VERSION 3.19.0) project(TlsClient) set(CMAKE_CXX_STANDARD 14) set(CMAKE_CXX_STANDARD_REQUIRED True) set(ASIO_dir ${PROJECT_SOURCE_DIR}/asio-1.18.1) # Imports pthread for Asio set(THREADS_PREFER_PTHREAD_FLAG ON) find_package(Threads REQUIRED) find_package(OpenSSL REQUIRED) # Executable add_executable(TlsClient client.cpp) #include asio target_include_directories(TlsClient PUBLIC "${ASIO_dir}/include" ) target_link_libraries( TlsClient ${CMAKE_USE_PTHREADS_INIT} ) if(${OPENSSL_FOUND}) message(NOTICE "OpenSSL library version ${OPENSSL_VERSION}" ) target_include_directories(TlsClient PUBLIC ${OPENSSL_INCLUDE_DIR}) target_link_libraries( TlsClient ${OPENSSL_SSL_LIBRARY} ${CMAKE_DL_LIBS}) else() message(NOTICE "Unable to find OpenSSL library") endif() 

The cmake yields the following error

[main] Configuring folder: TLS [proc] Executing command: /snap/bin/cmake --no-warn-unused-cli -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_C_COMPILER:FILEPATH=/bin/gcc-10 -DCMAKE_CXX_COMPILER:FILEPATH=/bin/g++-10 -H/home/r0n9/Code/cpp/TLS -B/home/r0n9/Code/cpp/TLS/build -G "Unix Makefiles" [cmake] Not searching for unused variables given on the command line. [cmake] OpenSSL library version 1.1.1f [cmake] -- Configuring done [cmake] -- Generating done [cmake] -- Build files have been written to: /home/r0n9/Code/cpp/TLS/build [main] Building folder: TLS clean [build] Starting build [proc] Executing command: /snap/bin/cmake --build /home/r0n9/Code/cpp/TLS/build --config Debug --target clean -- [build] Build finished with exit code 0 [main] Building folder: TLS [build] Starting build [proc] Executing command: /snap/bin/cmake --build /home/r0n9/Code/cpp/TLS/build --config Debug --target all -- -j 18 [build] [ 50%] Building CXX object CMakeFiles/TlsClient.dir/client.cpp.o [build] [100%] Linking CXX executable TlsClient [build] /usr/bin/ld: cannot find -l1 <----Not sure why this library is required [build] collect2: error: ld returned 1 exit status [build] make[2]: *** [CMakeFiles/TlsClient.dir/build.make:104: TlsClient] Error 1 [build] make[1]: *** [CMakeFiles/Makefile2:95: CMakeFiles/TlsClient.dir/all] Error 2 [build] make: *** [Makefile:103: all] Error 2 [build] Build finished with exit code 2 

Update1: The output of

message(NOTICE "OpenSSL library version [${OPENSSL_VERSION}], [${OPENSSL_INCLUDE_DIR}], [${OPENSSL_LIBRARIES}], [${CMAKE_DL_LIBS}]" ) 

is

[cmake] OpenSSL library version [1.1.1f], [/usr/include], [/usr/lib/x86_64-linux-gnu/libssl.so;/usr/lib/x86_64-linux-gnu/libcrypto.so], [dl]