I'm trying to build current on my IIci and I got the following output 
from make:

cpp  -traditional -D_LOCORE  -Dmac68k -I.  -I../../../../arch 
-I../../../.. -nostdinc -DHZ="0x3c" -DM68030 -DFPU_EMULATE -DLKM 
-DGRF_COMPAT -DMAXUSERS=16 -D_KERNEL -D_KERNEL_OPT 
/sys/arch/mac68k/compile/YOU-OAR/../../../../compat/linux/arch/m68k/linux_sig_machdep.S 
| sed -e 's/^#.*//' |  as -o linux_sig_machdep.o
{standard input}: Assembler messages:
{standard input}:302: Error: "instruction/operands mismatch" -- 
Statement 'moveq #LINUX_SYS_exit,%d0' ignored
*** Error code 1

In case anyone is wondering about my config name; The machine is called 
'dinghy'.

Is the linux compatibility known to be broken for mac68k? It's not like 
I really need it, though I do hate to do another 1h45m make depend :)