Неизвестный параметр командной строки '-stdlib=libstdc++'

Я получаю сообщение об ошибке компилятора g++ (компиляция бета-версии OpenCV 3.0) в OS X 10.10.3 Yosemite.

g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin14/5.0.1/lto-wrapper
Target: x86_64-apple-darwin14
Configured with: /opt/local/var/macports/build/_opt_mports_dports_lang_gcc5/gcc5/work/gcc-5-20150421/configure --prefix=/opt/local --build=x86_64-apple-darwin14 --enable-languages=c,c++,objc,obj-c++,fortran,java --libdir=/opt/local/lib/gcc5 --includedir=/opt/local/include/gcc5 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-5 --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-5 --with-gxx-include-dir=/opt/local/include/gcc5/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --with-isl=/opt/local --enable-stage1-checking --disable-multilib --enable-lto --enable-libstdcxx-time --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket --with-pkgversion='MacPorts gcc5 5-20150421_0'
Thread model: posix
gcc version 5.0.1 20150421 (prerelease) (MacPorts gcc5 5-20150421_0) 

$ cd ~/opencv-3.0.0-beta/samples/cpp

$ g++ -ggdb `pkg-config --cflags --libs opencv` -stdlib=libstdc++ facedetect.cpp -o facedetect
g++: error: unrecognized command line option '-stdlib=libstdc++'

$ cd ~/opencv-3.0.0-beta/build
$ make
[  2%] Built target zlib
[  2%] Building CXX object 3rdparty/libtiff/CMakeFiles/libtiff.dir/tif_stream.cxx.o
c++: error: unrecognized command line option '-stdlib=libstdc++'
make[2]: *** [3rdparty/libtiff/CMakeFiles/libtiff.dir/tif_stream.cxx.o] Error 1
make[1]: *** [3rdparty/libtiff/CMakeFiles/libtiff.dir/all] Error 2