Hi,

thanks for reporting. We don't consider Mac OS to be supported by grml2usb, since - at least to our knowledge 
- syslinux/GRUB aren't available in according versions there and just getting the mbr stuff to compile would 
be just the start to support grml2usb on Mac OS.

If someone has patches for grml2usb to get it working on Mac OS I'd be happy to discuss this. But for now no 
one in our team cares to write them, so closing this bug report with won't fix.

regards,
Mika

git commit 0ab2a7261eef1435cf5b0ce1180e826f4c663414

Mac OS X 10.8.3 Build 12D78

$ make -C mbr
cc -D_ASM_SOURCE -DBOOTMANAGER -D__BOOT_VER=\"0AA6\" -c mbr.S
mbr.S:79:suffix or operands invalid for `jnz'
mbr.S:90:suffix or operands invalid for `call'
mbr.S:93:suffix or operands invalid for `call'
mbr.S:96:suffix or operands invalid for `call'
mbr.S:100:suffix or operands invalid for `call'
mbr.S:142:suffix or operands invalid for `jmp'
mbr.S:147:suffix or operands invalid for `jz'
mbr.S:158:suffix or operands invalid for `jb'
mbr.S:159:Unexpected token `('
mbr.S:160:suffix or operands invalid for `jb'
mbr.S:162:suffix or operands invalid for `ja'
mbr.S:174:suffix or operands invalid for `jbe'
mbr.S:176:suffix or operands invalid for `je'
mbr.S:179:suffix or operands invalid for `jb'
mbr.S:210:suffix or operands invalid for `call'
mbr.S:212:suffix or operands invalid for `call'
mbr.S:227:suffix or operands invalid for `jne'
mbr.S:234:suffix or operands invalid for `call'
mbr.S:247:suffix or operands invalid for `jnz'
mbr.S:267:Unknown pseudo-op: .size
mbr.S:267:Rest of line ignored. 1st junk character valued 100 (d).
mbr.S:282:Unknown pseudo-op: .size
mbr.S:282:Rest of line ignored. 1st junk character valued 76 (L).
make: *** [mbrmgr] Error 1