Building bootable USB thumbdrive on a Mac

[stefanlasiewski]

I am running Snow Leopard.

I want to build a iPXE bootable USB thumbdrive image and I am following the instructions from http://ipxe.org/download#using_a_boot_cd-rom_or_usb_key

But when I try that, I get an error:

Code:

~/src/ipxe/src $ make bin/ipxe.usb
FATAL:/usr/bin/../libexec/gcc/darwin/x86_64/as: I don't understand '-' flag!
  [BUILD] bin/usbdisk.o
FATAL:/usr/bin/../libexec/gcc/darwin/x86_64/as: I don't understand '-' flag!
make: *** [bin/usbdisk.o] Error 1

Is it possible to build the usb image on a Mac?

Thank you,

-= Stefan