[Q] Error while compiling a ROM.

I'm getting this error while compiling a CM12 based ROM.

Code:

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frameworks/native/libs/ui/GraphicBufferMapper.cpp:52:43: error: definition of implicitly-declared 'android::GraphicBufferMapper::~GraphicBufferMapper()'
GraphicBufferMapper::~GraphicBufferMapper();

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There is a "^" under the "()" symbol.
The code is as follows (note: It is a shortened code as the whole code is huge).

Code:

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ANDROID_SINGLETON_STATIC_INSTANCE( GraphicBufferMapper )

GraphicBufferMapper::GraphicBufferMapper()
    : mAllocMod(0)
{
    hw_module_t const* module;
    int err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
    ALOGE_IF(err, "FATAL: can't find the %s module", GRALLOC_HARDWARE_MODULE_ID);
    if (err == 0) {
        mAllocMod = (gralloc_module_t const *)module;
    }
}

#ifdef MTK_MT6589
GraphicBufferMapper::~GraphicBufferMapper()            //ERROR IN THIS LINE
{
    gralloc_extra_close(mExtraDev);
}
#endif

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