Error compiling 64 bit R-devel on Leopard (package graphics)

Hi All,

I am trying to compile R-devel on a new MacPro but I am having some difficulties compiling from source. 
The problem appears when I add the option --with-acqua, see the message error below. If I set --without-acqua, everything is fine.
I have searched the list for related issues but I could not find anything that would help me. There is an email from Vince Carey with a similar issue, but no fix is posted as far as I could tell.

Here is the end of the building process:

building package 'utils'
all.R is unchanged
make[4]: Nothing to be done for `iconvlist'.
building package 'grDevices'
all.R is unchanged
make[6]: `Makedeps' is up to date.
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c chull.c -o chull.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c devNull.c -o devNull.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c devPicTeX.c -o devPicTeX.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c devPS.c -o devPS.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c devQuartz.c -o devQuartz.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c init.c -o init.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c qdBitmap.c -o qdBitmap.o
gcc -arch x86_64 -std=gnu99 -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include    -fPIC  -g -O2 -c qdPDF.c -o qdPDF.o
gcc -I../../../../include -I../../../include -I../../../../src/include -DHAVE_CONFIG_H -I/usr/local/include   -fPIC  -g -O2 -c qdCocoa.m -o qdCocoa.o
gcc -arch x86_64 -std=gnu99 -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/usr/local/lib -o grDevices.so chull.o devNull.o devPicTeX.o devPS.o devQuartz.o init.o qdBitmap.o qdPDF.o qdCocoa.o -framework AppKit -L../../../../lib -lR -Wl,-framework -Wl,CoreFoundation
ld warning: in qdCocoa.o, file is not of required architecture
building package 'graphics'
all.R is unchanged
Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  unable to load shared library '/Users/gottarr/Downloads/trunk/library/grDevices/libs/grDevices.so':
  dlopen(/Users/gottarr/Downloads/trunk/library/grDevices/libs/grDevices.so, 6): Symbol not found: _QuartzCocoa_DeviceCreate
  Referenced from: /Users/gottarr/Downloads/trunk/library/grDevices/libs/grDevices.so
  Expected in: dynamic lookup
Calls: <Anonymous> ... namespaceImport -> loadNamespace -> library.dynam -> dyn.load
Execution halted
make[4]: *** [mklazy] Error 1
make[3]: *** [all] Error 2
make[2]: *** [R] Error 1
make[1]: *** [R] Error 1
make: *** [R] Error 1

Here is the options that I use during configure:
./configure CC='gcc -arch x86_64' CXX='g++ -arch x86_64' F77='gfortran -arch x86_64' FC='gfortran -arch x86_64' --with-blas='-framework vecLib' --with-lapack --with-aqua --with-readline --without-tcltk --with-system-zlib

I have successfully compiled R-devel on my older MacPro running the exact same version of Leopard with gcc/gfortran 4.2, just a few days ago. So I don't really understand what's going on. Am I missing something trivial?
Note that the new machine I have has a "Nehalem" processor, could this explains the difference?

Here are some more info in case you need it:
got10:trunk gottarr$ sw_versProductName:	Mac OS XProductVersion:	10.5.7
BuildVersion:	9J61
got10:trunk gottarr$ system_profiler | more
Hardware:

    Hardware Overview:

      Model Name: Mac Pro
      Model Identifier: MacPro4,1
      Processor Name: Quad-Core Intel Xeon
      Processor Speed: 2.93 GHz
      Number Of Processors: 2
      Total Number Of Cores: 8
      L2 Cache (per core): 256 KB
      L3 Cache (per processor): 8 MB
      Memory: 16 GB
      Processor Interconnect Speed: 6.4 GT/s
      Boot ROM Version: MP41.0081.B04
      SMC Version (system): 1.39f5
      SMC Version (processor tray): 1.39f5

Thanks in advance,

Raphael