A build --all -- -P2 build on a dual core machine fails with:

guw.pl link /COMMENT:"vcl_680__"  /MACHINE:IX86 @/tmp/mkXkKHTN |& /bin/grep.exe
-v "LNK4197:"
Making: ../wntmsci10.pro/bin/vcl680mi.dll
Microsoft (R) Incremental Linker Version 7.10.3077
Copyright (C) Microsoft Corporation.  All rights reserved.

/MAP /OPT:NOREF /NODEFAULTLIB /RELEASE /DEBUG:full /SUBSYSTEM:CONSOLE /DLL
/ENTRY:LibMain@12 -out:../wntmsci10.pro/bin/vcl680mi.dll
-map:../wntmsci10.pro/misc/vcl680mi.map -def:../wntmsci10.pro/misc/vcl680mi.def
-implib:../wntmsci10.pro/lib/ivcl.lib ..\wntmsci10.pro\slo\vcl_dflt_version.obj
..\wntmsci10.pro\slo\vcl_dflt_description.obj ..\wntmsci10.pro\slo\salshl.obj
..\wntmsci10.pro\slb\vcl.lib sot.lib iutl.lib itools.lib ii18nisolang.lib
icomphelp.lib iucbhelper.lib icppuhelper.lib icppu.lib ivos.lib isal.lib
ibasegfx.lib icuuc.lib icule.lib ijvmaccess.lib uwinapi.lib gdi32.lib
winspool.lib ole32.lib shell32.lib advapi32.lib apsp.lib imm32.lib msvcrt.lib
uwinapi.lib kernel32.lib user32.lib oldnames.lib stlport_vc71.lib
..\wntmsci10.pro\misc\vcl680mi.res 
../wntmsci10.pro/misc/vcl680mi.def(2) : warning LNK4017: DESCRIPTION statement
not supported for the target platform; ignored
../wntmsci10.pro/misc/vcl680mi.def(3) : warning LNK4017: DATA statement not
supported for the target platform; ignored
   Creating library ../wntmsci10.pro/lib/ivcl.lib and object
../wntmsci10.pro/lib/ivcl.exp
vcl.lib(image.obj) : warning LNK4217: locally defined symbol
??0Color@@QAE@ABVResId@@@Z (public: __thiscall Color::Color(class ResId const
&)) imported in function "public: __thiscall Image::Image(class ResId const &)"
(??0Image@@QAE@ABVResId@@@Z)
vcl.lib(outdev2.obj) : error LNK2019: unresolved external symbol "public: void
__thiscall SalGraphics::mirror(long &,long &,class OutputDevice const *)"
(?mirror@SalGraphics@@QAEXAAJ0PBVOutputDevice@@@Z) referenced in function
"public: void __thiscall OutputDevice::ImplDrawOutDevDirect(class OutputDevice
const *,void *)" (?ImplDrawOutDevDirect@OutputDevice@@QAEXPBV1@PAX@Z)
vcl.lib(opengl.obj) : error LNK2001: unresolved external symbol "public: void
__thiscall SalGraphics::mirror(long &,long &,class OutputDevice const *)"
(?mirror@SalGraphics@@QAEXAAJ0PBVOutputDevice@@@Z)
vcl.lib(outdev5.obj) : error LNK2019: unresolved external symbol "public:
__thiscall MetaRoundRectAction::MetaRoundRectAction(class Rectangle const
&,long,long)" (??0MetaRoundRectAction@@QAE@ABVRectangle@@JJ@Z) referenced in
function "public: void __thiscall OutputDevice::DrawRect(class Rectangle const
&,unsigned long,unsigned long)" (?DrawRect@OutputDevice@@QAEXABVRectangle@@KK@Z)
../wntmsci10.pro/bin/vcl680mi.dll : fatal error LNK1120: 2 unresolved externals
dmake:  Error code 96, while making '../wntmsci10.pro/bin/vcl680mi.dll'
---* tg_merge.mk *---

Full logfile:
<http://go-oo.org/tinderbox/gunzip.cgi?tree=tml01&brief-log=1146638978.24533>

(tml01 is m164 plus some config_office changes)