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/usr/include/c++/v1/__undef___deallocate is in libc++-dev 3.7.0-1.

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifdef __deallocate
#if defined(_MSC_VER) && !defined(__clang__)
_LIBCPP_WARNING("macro __deallocate is incompatible with C++.  #undefining __deallocate")
#else
#warning: macro __deallocate is incompatible with C++.  #undefining __deallocate
#endif
#undef __deallocate
#endif