my $pid = open my $calc, '-|', "$command 2>&1" or die "Pipe failed on open: $!\n";
local $SIG{ALRM} = sub {
    kill 9, $pid;
    die "Calculation call failed to return with $timeout seconds\n";
};
alarm $timeout;
local $/; # Slurp
my $content = <$calc>;
close $calc;
alarm 0;