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/usr/include/flext/flpopns.h is in pd-flext-dev 0.6.0+git20161101.1.01318a94-3.

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/*
flext - C++ layer for Max and Pure Data externals

Copyright (c) 2001-2015 Thomas Grill (gr@grrrr.org)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/

#ifdef FLEXT_USE_NAMESPACE

#ifndef _FLEXT_IN_NAMESPACE
    #error flext namespace pop is unbalanced
#endif

#define __FLEXT_IN_NAMESPACE (_FLEXT_IN_NAMESPACE-1)
#undef _FLEXT_IN_NAMESPACE
#define _FLEXT_IN_NAMESPACE __FLEXT_IN_NAMESPACE
#undef __FLEXT_IN_NAMESPACE

#if _FLEXT_IN_NAMESPACE == 0

    #if 1 //defined(FLEXT_SHARED)
    } // namespace
    using namespace flext_ns;
    #elif defined(__GNUC__)
    } // anonymous namespace (don't export symbols)
    #endif
    
    #undef _FLEXT_IN_NAMESPACE
    
#endif
    
#endif