fost-exe primes-multi
    :
        is_prime-fast.cpp
        primes-multi.cpp
    ;

fost-exe primes-single
    :
        is_prime-fast.cpp
        primes-single.cpp
    ;

fost-exe primes-multi-slow
    :
        is_prime-slow.cpp
        primes-multi.cpp
    ;

fost-exe primes-single-slow
    :
        is_prime-slow.cpp
        primes-single.cpp
    ;