[Libreoffice] C{,PP}FLAGS ignored in sal

Hi!

I'm building LO with:
./autogen.sh --with-git --with-system-libs --with-system-headers --with-system-zlib 
--with-system-jpeg --with-system-libxslt --with-system-libxml --with-system-mesa-headers 
--with-system-cairo --with-system-mozilla=mozilla --with-system-saxon --with-system-lucene 
--with-system-openssl CFLAGS="-I/usr/pkg/include -I/usr/X11R7/include" 
CPPFLAGS="-I/usr/pkg/include" LDFLAGS="-L/usr/pkg/lib -Wl,-R/usr/pkg/lib" QTDIR=/usr/pkg/qt4 
--with-jdk-home=/usr/pkg/java/openjdk7 --with-max-jobs=1 --with-num-cpus=1 --disable-kde 
--disable-kde4 --with-system-mdds=no --with-system-altlinuxhyph=no --with-openldap --without-junit 
--with-system-mythes=no

The build fails with:
Compiling: sal/osl/all/debugbase.cxx
g++ -fmessage-length=0 -c -O1 -DENABLE_LAYOUT=0 -DENABLE_LAYOUT_EXPERIMENTAL=0   
-D_FILE_OFFSET_BITS=no -I. -I../../unxbsdx3.pro/inc/oslall -I../inc -I../../inc/pch -I../../inc 
-I../../unx/inc -I../../unxbsdx3.pro/inc -I. 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solver/330/unxbsdx3.pro/inc/stl 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solver/330/unxbsdx3.pro/inc/external 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solver/330/unxbsdx3.pro/inc 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solenv/unxbsdx3/inc 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solenv/inc 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/res 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solver/330/unxbsdx3.pro/inc/stl 
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solenv/inc/Xp31 
-I/usr/pkg/java/openjdk7/include -I/usr/pkg/java/openjdk7/include/netbsd 
-I/usr/pkg/java/openjdk7/include/native_threads/include -I/usr/X11R7/include  
-I/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/solver/330/unxbsdx3.pro/inc/offuh -I. 
-I../../res -I. -pipe   -Wno-ctor-dtor-privacy    -DNETBSD -DUNX -DVCL -DGCC -DC341 -DX86_64 
-DX86_64 -pthread -D_PTHREADS -D_REENTRANT -DNEW_SOLAR -D_USE_NAMESPACE=1 -DSTLPORT_VERSION=450 
-D__DMAKE -DUNIX -DCPPU_ENV=gcc3 -DGXX_INCLUDE_PATH=/usr/include/g++ -DSUPD=330 -DPRODUCT -DNDEBUG 
-DOSL_DEBUG_LEVEL=0 -DOPTIMIZE -DGSTREAMER -DCUI -DSOLAR_JAVA     -fexceptions 
-fno-enforce-eh-specs -DEXCEPTIONS_ON  -o ../../unxbsdx3.pro/obj/debugbase.o 
/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/sal/osl/all/debugbase.cxx
/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/sal/osl/all/debugbase.cxx:36:26: error: 
boost/bind.hpp: No such file or directory
/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/sal/osl/all/debugbase.cxx: In function 'bool 
osl_detail_ObjectRegistry_storeAddresses(const char*)':
/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/sal/osl/all/debugbase.cxx:104: error: 
'boost' has not been declared
/disk/2/archive/libreoffice/build/libreoffice-3.2.99.2/sal/osl/all/debugbase.cxx:104: error: '_1' 
was not declared in this scope
dmake:  Error code 1, while making '../../unxbsdx3.pro/obj/debugbase.obj'

I don't see my CFLAGS nor CPPFLAGS, which would make it find boost, in
the gcc arguments.
How can I make them used in this part of the build?
 Thomas