[uml-user] problem of building UML

[sean y. <sea...@ho...>]

I downloaded a 2.4.21 kernel and the corresponding patch, when I try to 
build the UML, I met the following problem.
>make xconfig ARCH=um
>make linux ARCH=um
.....(lots of output here discarded, the following is error message)
make[4]: Entering directory 
`/export/home/uml/linux-2.4.21/arch/um/kernel/tt/ptproxy'
gcc   -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing 
-fno-common -U__i386__ -Ui386 -DUM_FASTCALL -g -D__arch_um__ 
-DSUBARCH=\"i386\" -D_LARGEFILE64_SOURCE  
-I/export/home/uml/linux-2.4.21/arch/um/include 
-I/export/home/uml/linux-2.4.21/arch/um/kernel/tt/include -D_GNU_SOURCE -c 
-o proxy.o proxy.c
gcc   -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing 
-fno-common -U__i386__ -Ui386 -DUM_FASTCALL -g -D__arch_um__ 
-DSUBARCH=\"i386\" -D_LARGEFILE64_SOURCE  
-I/export/home/uml/linux-2.4.21/arch/um/include 
-I/export/home/uml/linux-2.4.21/arch/um/kernel/tt/include -D_GNU_SOURCE -c 
-o ptrace.o ptrace.c
gcc   -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing 
-fno-common -U__i386__ -Ui386 -DUM_FASTCALL -g -D__arch_um__ 
-DSUBARCH=\"i386\" -D_LARGEFILE64_SOURCE  
-I/export/home/uml/linux-2.4.21/arch/um/include 
-I/export/home/uml/linux-2.4.21/arch/um/kernel/tt/include -D_GNU_SOURCE -c 
-o sysdep.o sysdep.c
sysdep.c: In function `syscall_cancel':
sysdep.c:40: `errno' undeclared (first use in this function)
sysdep.c:40: (Each undeclared identifier is reported only once
sysdep.c:40: for each function it appears in.)
sysdep.c: In function `syscall_pause':
sysdep.c:56: `errno' undeclared (first use in this function)
make[4]: *** [sysdep.o] Error 1
make[4]: Leaving directory 
`/export/home/uml/linux-2.4.21/arch/um/kernel/tt/ptproxy'
make[3]: *** [first_rule] Error 2
make[3]: Leaving directory 
`/export/home/uml/linux-2.4.21/arch/um/kernel/tt/ptproxy'
make[2]: *** [_subdir_ptproxy] Error 2
make[2]: Leaving directory `/export/home/uml/linux-2.4.21/arch/um/kernel/tt'
make[1]: *** [_subdir_tt] Error 2
make[1]: Leaving directory `/export/home/uml/linux-2.4.21/arch/um/kernel'
make: *** [_dir_arch/um/kernel] Error 2

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