Не компилируется D

[RazrFalcon]

Оффсайт http://dlang.org/
Пример с главной:

Код: [Выделить]

#!/opt/dmd/bin/rdmd
// Computes average line length for standard input.
import std.stdio;

void main() {
    ulong lines = 0;
    double sumLength = 0;
    foreach (line; stdin.byLine()) {
        ++lines;
        sumLength += line.length;
    }
    writeln("Average line length: ",
        lines ? sumLength / lines : 0);
}

Код: [Выделить]

$ chmod +x hello.d
$ ./hello.d
/opt/dmd/src/phobos/std/conv.d(1468): number is not representable
/opt/dmd/src/phobos/std/math.d(703): number is not representable
/opt/dmd/src/phobos/std/c/linux/linux.d(444): Error: Integer constant expression expected instead of _SIGSET_NWORDS
/opt/dmd/src/phobos/std/c/linux/linux.d(444): Error: Integer constant expression expected instead of _SIGSET_NWORDS
/opt/dmd/src/phobos/std/c/linux/linux.d(444): Error: Integer constant expression expected instead of _SIGSET_NWORDS
/opt/dmd/src/phobos/std/c/linux/linux.d(444): Error: Integer constant expression expected instead of _SIGSET_NWORDS
/opt/dmd/bin/rdmd: Couldn't compile or execute ./hello.d.
Какие есть соображения?