fixed compilation error

modules/boost.cmake

@@ -19,7 +19,6 @@ if ( UNIX )
       ExternalProject_Add( Boost
         PREFIX Boost
         GIT_REPOSITORY ${BOOST_URL}
-        GIT_SUBMODULES  libs/asio libs/date_time libs/assert libs/config libs/core  libs/detail libs/functional libs/io libs/iterator libs/mpl libs/predef libs/preprocessor libs/range libs/smart_ptr libs/static_assert libs/throw_exception libs/type_traits libs/system libs/filesystem   tools/build tools/bcp 
         UPDATE_COMMAND ./bootstrap.sh --with-libraries=filesystem,system --includedir=${CMAKE_BINARY_DIR}/include/
         CONFIGURE_COMMAND ./b2 headers 
         BUILD_COMMAND ./b2 link=static install --libdir=${CMAKE_BINARY_DIR}/lib
@@ -31,4 +30,4 @@ if ( UNIX )
       SET_TARGET_PROPERTIES (Boost_LIB PROPERTIES IMPORTED_LOCATION ${FILESYSTEM_STATIC_LIBRARIES})
       SET_TARGET_PROPERTIES (Boost_LIB PROPERTIES IMPORTED_LOCATION ${SYSTEM_STATIC_LIBRARIES})
     endif ()
-endif()
+endif()
\ No newline at end of file

src/agent/main.cpp

@@ -74,7 +74,7 @@ void setBegin() {
          std::fstream::app | std::fstream::in | std::fstream::out);
     getline(myfile, t);
     if (t.size() == 0) {
-        begin = second_clock::local_time();
+        begin = boost::posix_time::second_clock::local_time();
         myfile << begin;
         myfile << "\n";
     } else {