$ mkdir build && cd build
$ cmake -S .. -B .
$ make
$ ./helloworld
Ninja needs
$ mkdir build && cd build
$ cmake -S .. -B . -G Ninja
$ ninja
$ ./helloworld
$ mkdir build && cd build
$ cmake -S .. -B .
$ make
$ ./helloworld
Ninja needs
$ mkdir build && cd build
$ cmake -S .. -B . -G Ninja
$ ninja
$ ./helloworld