scons: Building targets ...
g++ -o src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.os -c -Dlong32='int' "-Dlong64='long long'" -m64 -pthread -rdynamic -g -pg -fPIC -Ithird_party/install/include -Ithird_party/install/include/python2.7 -Ithird_party/install/include/root -Isrc/common -Ithird_party/build/root_v5.28.00a/include -Ithird_party/build/geant4.9.2.p04/include -I. -Isrc/map/MapCppBeamMaker src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc: In function 'int SWIG_Python_ConvertFunctionPtr(PyObject*, void**, swig_type_info*)':
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc:2051: error: invalid conversion from 'const char*' to 'char*'
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc: In function 'int SWIG_AsCharPtrAndSize(PyObject*, char**, size_t*, int*)':
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc:2579: error: cannot convert 'int*' to 'Py_ssize_t*' for argument '3' to 'int PyString_AsStringAndSize(PyObject*, char**, Py_ssize_t*)'
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc: In function 'void SWIG_Python_FixMethods(PyMethodDef*, swig_const_info*, swig_type_info**, swig_type_info**)':
src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.cc:3291: error: invalid conversion from 'const char*' to 'char*'
scons: * [src/map/MapCppBeamMaker/build/MapCppBeamMaker_wrap.os] Error 1
scons: building terminated because of errors.
make: * [all] Error 2

Easily fixed by changing various declarations of type char* to const char* and of int to Py_ssize_t.

This may have shown up because I'm using gcc 4.3, but gcc 4.3 is very common on rhel5 derived systems because it's the only compiler fully tested for use with root and lhc and cern software.