make ARCH=um
  SYMLINK arch/um/include/kern_constants.h
  SYMLINK arch/um/include/sysdep
  CC      arch/um/sys-x86_64/user-offsets.s
arch/um/sys-x86_64/user-offsets.c:16:22: error: asm/user.h: Nie ma takiego pliku ani katalogu
arch/um/sys-x86_64/user-offsets.c: In function ‘foo’:
arch/um/sys-x86_64/user-offsets.c:91: error: invalid application of ‘sizeof’ to incomplete type ‘struct user_regs_struct’ 
make[1]: *** [arch/um/sys-x86_64/user-offsets.s] Błąd 1
make: *** [arch/um/sys-x86_64/user-offsets.s] Błąd 2