Compilation error of R-2.14.0 on Mac OS 10.7.2

Dear R gurus,

I attempt to install the latest version of R from source on my MacBook Pro,
using latest versions of Xcode and gfortran for Lion and configure options:

./configure --with-libintl-prefix=/sw --enable-R-shlib (this last option
necessary to further install the Rpy Python package)

I got the following unreduced compilation error:

gcc -std=gnu99 -dynamiclib -Wl,-headerpad_max_install_names -undefined
dynamic_lookup -single_module -multiply_defined suppress -L/sw/lib
-L/usr/local/lib -o tools.so text.o init.o Rmd5.o md5.o signals.o
-L../../../../lib -lR -dylib_file
libRblas.dylib:../../../../lib/libRblas.dylib -lintl -Wl,-framework
-Wl,CoreFoundation
make[6]: `Makedeps' is up to date.
mkdir ../../../../library/tools/libs
Error in dyn.load(file, DLLpath = DLLpath, ...) :
  unable to load shared object
'/Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so':
  dlopen(/Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so, 6):
Symbol not found: _libintl_dgettext
  Referenced from:
/Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so
  Expected in: /Users/marquett/Downloads/R-2.14.0/lib/libR.dylib
 in /Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so
Error: impossible de charger le code R depuis le package ?tools?
Execution halted
make[3]: *** [all] Error 1
make[2]: *** [R] Error 1
make[1]: *** [R] Error 1
make: *** [R] Error 1

However the binary file matches the unresolved symbol:

grep _libintl_dgettext
/Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so
Binary file /Users/marquett/Downloads/R-2.14.0/library/tools/libs/tools.so
matches

Any help welcome.

Cheers
Jean-Baptiste