D:\path\to\submissions>g++ --std=c++11 -O3 feersum.cpp
feersum.cpp: In function 'void endit()':
feersum.cpp:96:5: error: 'this_thread' has not been declared
     this_thread::sleep_for(chrono::seconds(599));
     ^
feersum.cpp: In function 'int main(int, char**)':
feersum.cpp:104:46: error: 'stricmp' was not declared in this scope
         print |= ac>1 && !stricmp(av[1], "-P");
                                              ^
feersum.cpp:108:5: error: 'thread' was not declared in this scope
     thread KILLER;
     ^
feersum.cpp:108:12: error: expected ';' before 'KILLER'
     thread KILLER;
            ^
feersum.cpp:110:9: error: 'KILLER' was not declared in this scope
         KILLER = thread(endit);
         ^