user@networkslab:~/NetworksLab2018/simple_udp/server/server_linux$ make
Scanning dependencies of target server_linux
[ 50%] Building C object CMakeFiles/server_linux.dir/main.c.o
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c: In function ‘main’:
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:23:13: warning: unused variable ‘n’ [-Wunused-variable]
     ssize_t n;
             ^
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:21:10: warning: unused variable ‘buffer’ [-Wunused-variable]
     char buffer[256];
          ^~~~~~
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:17:14: warning: unused parameter ‘argc’ [-Wunused-parameter]
 int main(int argc, char *argv[]) {
              ^~~~
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:17:26: warning: unused parameter ‘argv’ [-Wunused-parameter]
 int main(int argc, char *argv[]) {
                          ^~~~
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c: In function ‘connection_handler’:
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:80:11: warning: unused variable ‘new_message’ [-Wunused-variable]
     char *new_message , buffer[256];
           ^~~~~~~~~~~
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c: In function ‘main’:
/home/user/NetworksLab2018/simple_udp/server/server_linux/main.c:60:18: warning: ‘cli_addr’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     sct.cli_addr = cli_addr;
     ~~~~~~~~~~~~~^~~~~~~~~~
[100%] Linking C executable server_linux
CMakeFiles/server_linux.dir/main.c.o: In function `main':
main.c:(.text+0x159): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/server_linux.dir/build.make:94: recipe for target 'server_linux' failed
make[2]: *** [server_linux] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/server_linux.dir/all' failed
make[1]: *** [CMakeFiles/server_linux.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2