Problem in prop_array when compiling 4.0.1 kernel

[Philip Dodd <philip.dodd%free.fr@localhost>]

Hi,

I've been trying, unsuccessfully, to compile a kernel on 4.0.1.

It fails with warnings :
:
:
making sure the kern library is up to date...
#   compile  kern/prop_array.o
cc -ffreestanding -fno-zero-initialized-in-bss   -O2 -Werror -Wall 
-Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes 
-Wstrict-prototypes -Wswitch -Wshadow -Wcast-qual -Wwrite-strings 
-Wno-sign-compare -Wno-pointer-sign -Wno-attributes -Wextra 
-Wno-unused-parameter  -fno-strict-aliasing   
-I../../../../../../lib/libkern/arch/i386 -Di386 -I../../. 
-I../../../../../../../common/include -I../../../../../../arch 
-I../../../../../.. -nostdinc -DLKM -DMAXUSERS=32 -D_KERNEL 
-D_KERNEL_OPT 
-I../../../../../../lib/libkern/../../../common/lib/libc/quad 
-I../../../../../../lib/libkern/../../../common/lib/libc/string 
-I../../../../../../lib/libkern/../../../common/lib/libc/arch/i386/string 
-I../../../../../../dist/ipf  
-I../../../../../../lib/libkern/../../../common/lib/libc/quad 
-I../../../../../../lib/libkern/../../../common/lib/libc/string 
-I../../../../../../lib/libkern/../../../common/lib/libc/arch/i386/string 
-I../../../../../../lib/libkern/../../../common/include    -c    
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c 
-o prop_array.o
cc1: warnings being treated as errors
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c: 
In function '_prop_array_equals':
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c:216: 
warning: cast from pointer to integer of different size
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c:220: 
warning: cast from pointer to integer of different size
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c:220: 
warning: cast from pointer to integer of different size
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c:237: 
warning: cast to pointer from integer of different size
../../../../../../lib/libkern/../../../common/lib/libprop/prop_array.c:238: 
warning: cast to pointer from integer of different size
*** Error code 1


Strangely (and I've no idea whether this a red-herring or not) the page 
here :

http://ftp.netbsd.org/pub/NetBSD/NetBSD-4.0.1/CHANGES-4.0.1 states 
version 1.5 of file prop_array.3 :

common/lib/libprop/prop_array.3                 1.5

Yet on my box if I do :

$ head -1 ./prop_array.3
.\"     $NetBSD: prop_array.3,v 1.4.16.1 2008/09/24 18:06:46 bouyer Exp $

This source is taken from the tarball here : 
http://ftp.netbsd.org/pub/NetBSD/NetBSD-4.0.1/source/sets/

I'd appreciate any pointers anyone can give me.  Is this likely to be a config 
issue (I'm a n00b at compiling NetBSD kernels)?

Thanks in advance,

Phil