Compile erros when compling uCLinux for NIOS II

I get these series of errors when I run make in order to compile uCLinux for NIOS II.

CC      arch/nios2nommu/kernel/asm-offsets.s
  CHK     include/asm-nios2nommu/asm-offsets.h
  UPD     include/asm-nios2nommu/asm-offsets.h
  CC      init/main.o
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  CC      init/do_mounts.o
  CC      init/do_mounts_rd.o
  CC      init/do_mounts_initrd.o
In file included from include/linux/unistd.h:9,
                 from init/do_mounts_initrd.c:2:
include/asm/unistd.h:659: error: parse error before "setsid"
include/asm/unistd.h:659: warning: return type defaults to `int'
include/asm/unistd.h: In function `setsid':
include/asm/unistd.h:659: error: `pid_t' undeclared (first use in this function)
include/asm/unistd.h:659: error: (Each undeclared identifier is reported only once
include/asm/unistd.h:659: error: for each function it appears in.)
include/asm/unistd.h: At top level:
include/asm/unistd.h:660: error: parse error before "off_t"
include/asm/unistd.h:660: warning: function declaration isn't a prototype
include/asm/unistd.h: In function `write':
include/asm/unistd.h:660: error: `fd' undeclared (first use in this function)
include/asm/unistd.h:660: error: `buf' undeclared (first use in this function)
include/asm/unistd.h:660: error: `count' undeclared (first use in this function)
include/asm/unistd.h: At top level:
include/asm/unistd.h:661: error: parse error before "off_t"
include/asm/unistd.h:661: warning: function declaration isn't a prototype
include/asm/unistd.h: In function `read':
include/asm/unistd.h:661: error: `fd' undeclared (first use in this function)
include/asm/unistd.h:661: error: `buf' undeclared (first use in this function)
include/asm/unistd.h:661: error: `count' undeclared (first use in this function)
include/asm/unistd.h: At top level:
include/asm/unistd.h:662: error: parse error before "lseek"
include/asm/unistd.h:662: error: parse error before "off_t"
include/asm/unistd.h:662: warning: return type defaults to `int'
include/asm/unistd.h:662: warning: function declaration isn't a prototype
include/asm/unistd.h: In function `lseek':
include/asm/unistd.h:662: error: `fd' undeclared (first use in this function)
include/asm/unistd.h:662: error: `offset' undeclared (first use in this function)
include/asm/unistd.h:662: error: `count' undeclared (first use in this function)
include/asm/unistd.h:662: error: `off_t' undeclared (first use in this function)
include/asm/unistd.h: At top level:
include/asm/unistd.h:668: error: parse error before "waitpid"
include/asm/unistd.h:668: error: parse error before "pid"
include/asm/unistd.h:668: warning: return type defaults to `int'
include/asm/unistd.h:668: warning: function declaration isn't a prototype
include/asm/unistd.h: In function `waitpid':
include/asm/unistd.h:668: error: `pid' undeclared (first use in this function)
include/asm/unistd.h:668: error: `wait_stat' undeclared (first use in this function)
include/asm/unistd.h:668: error: `options' undeclared (first use in this function)
include/asm/unistd.h:668: error: `pid_t' undeclared (first use in this function)
include/asm/unistd.h: At top level:
include/asm/unistd.h:671: error: parse error before "wait"
include/asm/unistd.h:672: warning: return type defaults to `int'
make: ***  Error 1
make: ***  Error 2