How Do I Run the Assembly in OS X 10.11

How do I run the assembly on OS X 10.11?
GCC seems to be able to assemble normally (gcc-o hello world hello world.s).
What should I do with clang?

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I understood that there was a command in OS X called as, which seems to be a command for assembling.

Additional 2

as-arch x86_64-o helloworld helloworld.s generated a file called hellowworld, but I cannot successfully ld after that.
I tried ld-macosx_version_min 10.11 helloworld.
I get the following error

ld:warning:-macosx_version_min not specified,assuming 10.10
ld: warning: object file (helloworld) was built for newer OSX version (10.11) than being linked (10.10)
ld —dynamic main executables must link with libSystem.dylib for referred architecture x86_64

# original: http://dustin.schultz.io/blog/2010/11/15/mac-os-x-64-bit-assembly-system-calls/

# # https://gist.github.com/h2so5/d429d0aec527482f6209

.data
hello_world:.asciz "Hello world!\n"

.text
.globl_main

_main:
mov$0x2000004,%rax
US>mov$1,%rdi
lea hello_world(%rip), %rsi
mov $14,%rdx
syscall
mov$0x2000001,%rax
mov $0,%rdi
syscall