hadoop 2.1.0-beta tarball only contains 32bit native libraries

I am setting up a cluster on 64bit linux and I noticed, that the tarball only ships with 32 bit libraries:

$ pwd
/opt/hadoop-2.1.0-beta/lib/native

$ ls -al
total 2376
drwxr-xr-x 2 67974 users 4096 Aug 15 20:59 .
drwxr-xr-x 3 67974 users 4096 Aug 15 20:59 ..
rw-rr- 1 67974 users 598578 Aug 15 20:59 libhadoop.a
rw-rr- 1 67974 users 764772 Aug 15 20:59 libhadooppipes.a
lrwxrwxrwx 1 67974 users 18 Aug 15 20:59 libhadoop.so -> libhadoop.so.1.0.0
-rwxr-xr-x 1 67974 users 407568 Aug 15 20:59 libhadoop.so.1.0.0
rw-rr- 1 67974 users 304632 Aug 15 20:59 libhadooputils.a
rw-rr- 1 67974 users 184414 Aug 15 20:59 libhdfs.a
lrwxrwxrwx 1 67974 users 16 Aug 15 20:59 libhdfs.so -> libhdfs.so.0.0.0
-rwxr-xr-x 1 67974 users 149556 Aug 15 20:59 libhdfs.so.0.0.0

$ file *
libhadoop.a: current ar archive
libhadooppipes.a: current ar archive
libhadoop.so: symbolic link to `libhadoop.so.1.0.0'
libhadoop.so.1.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, BuildID[sha1]=0x527e88ec3e92a95389839bd3fc9d7dbdebf654d6, not stripped
libhadooputils.a: current ar archive
libhdfs.a: current ar archive
libhdfs.so: symbolic link to `libhdfs.so.0.0.0'
libhdfs.so.0.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, BuildID[sha1]=0xddb2abae9272f584edbe22c76b43fcda9436f685, not stripped

$ hadoop checknative
13/08/28 18:11:17 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Native library checking:
hadoop: false
zlib: false
snappy: false
lz4: false
bzip2: false
13/08/28 18:11:17 INFO util.ExitUtil: Exiting with status 1