--- FindBoost.cmake.orig	2014-02-05 16:04:47.724575402 -0700
+++ FindBoost.cmake	2014-02-05 16:08:39.877376524 -0700
@@ -907,7 +907,11 @@
   set( _boost_docstring_debug   "Boost ${COMPONENT} library (debug)")
   if(${COMPONENT} STREQUAL "python" OR ${COMPONENT} STREQUAL "mpi_python")
     # Get version of Python.
-    execute_process(COMMAND python -c "import sys; sys.stdout.write('.'.join(str(x) for x in sys.version_info[:2]))" OUTPUT_VARIABLE _python_version)
+    if (NOT PYTHON_EXECUTABLE)
+      #if a certain version of python was detected by cmake before use that one
+      set(PYTHON_EXECUTABLE "python")
+    endif (NOT PYTHON_EXECUTABLE)
+    execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write('.'.join(str(x) for x in sys.version_info[:2]))" OUTPUT_VARIABLE _python_version)
   endif()