kdepim C++ build error

[ 0%] Building CXX object indexlib/CMakeFiles/index-shared.dir/compressed.cpp.o In file included from /trinity.source/kdepim/indexlib/compressed.h:38:0, from /trinity.source/kdepim/indexlib/compressed.cpp:32: /trinity.source/kdepim/indexlib/memvector.h:83:34: error: declaration of 'operator+=' as non-function /trinity.source/kdepim/indexlib/memvector.h:83:29: error: expected ';' at end of member declaration /trinity.source/kdepim/indexlib/memvector.h:83:44: error: expected ')' before 'dif' /trinity.source/kdepim/indexlib/memvector.h:88:3: error: 'ptrdiff_t' does not name a type make[2]: *** [indexlib/CMakeFiles/index-shared.dir/compressed.cpp.o] Error 1 make[1]: *** [indexlib/CMakeFiles/index-shared.dir/all] Error 2