root6 upgrade/install fails

[watsodw]

Error causes by some TMVA issue? See log.

:info:build [100%] Building CXX object tmva/tmvagui/CMakeFiles/TMVAGui.dir/src/correlationscattersMultiClass.cxx.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/build/tmva/tmvagui && /opt/local/bin/lang++-mp-3.7   -DTMVAGui_EXPORTS -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/build/include/root -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/build/include  -pipe -Os -arch x86_64 -stdlib=libc++  -m64 -pipe -W -Wall -Woverloaded-virtual -fsigned-char -fno-common -Qunused-arguments -pthread -std=c++11 -Wno-deprecated-declarations -Wc++11-narrowing -Wsign-compare -Wsometimes-uninitialized -Wconditional-uninitialized -Wheader-guard -Warray-bounds -Wcomment -Wtautological-compare -Wstrncat-size -Wloop-analysis -Wbool-conversion -stdlib=libc++ -DR__HAVE_CONFIG -O2 -DNDEBUG -arch x86_64 -fPIC   -o CMakeFiles/TMVAGui.dir/src/correlationscattersMultiClass.cxx.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/root-6-06-00/tmva/tmvagui/src/correlationscattersMultiClass.cxx
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/root-6-06-00/tmva/pymva/src/MethodPyAdaBoost.cxx:178:22: error: use of undeclared identifier 'PyString_FromString'
:info:build    PyObject *pName = PyString_FromString("sklearn.ensemble");
:info:build                      ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_root6/root6/work/root-6-06-00/tmva/pymva/src/MethodPyAdaBoost.cxx:264:14: error: use of undeclared identifier 'PyString_AsString'
:info:build    PyData << PyString_AsString(model_data);
:info:build              ^
:info:build 2 errors generated.
:info:build make[2]: *** [tmva/pymva/CMakeFiles/PyMVA.dir/src/MethodPyAdaBoost.cxx.o] Error 1
:info:build make[2]: *** Waiting for unfinished jobs....

Variants:

root6-6.06.00_0+clang37+cocoa+fftw3+fitsio+gcc5+graphviz+gsl+http+minuit2+opengl+pythia+python34+roofit+soversion+ssl+tmva+xml+xrootd.darwin_13.x86_64