Boost version requirement lifted.

CMakeLists.txt

@@ -33,10 +33,9 @@ if(DEFINED ENV{BOOST_ROOT})
     set(BOOST_ROOT "$ENV{BOOST_ROOT}")
     message("-- BOOST_ROOT is set: ${BOOST_ROOT}")
 else(DEFINED ENV{BOOST_ROOT})
-    message("-- Note: BOOST_ROOT not set.")
+    message("-- Note: BOOST_ROOT not set. Let's see whether we can find BOOST anyway.")
 endif(DEFINED ENV{BOOST_ROOT})
-message("-- BOOST_ROOT is set: ${BOOST_ROOT}")
-find_package(Boost 1.60.0 COMPONENTS python mpi filesystem serialization)
+find_package(Boost COMPONENTS python mpi filesystem serialization)
 include_directories(${Boost_INCLUDE_DIRS})
 
 find_package(MPI REQUIRED)