Error message in object pointer definition. Don't know what means.

[robgeek]

Good day!

What means the following error message and how can i fix it? I'm using QtCreator-5.3.2 with GCC-4.6.1 64bit.

warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11 [enabled by default]

Error pointing to this code line:

class Data : public QDialog
{
//...
    public:
    Historic *hs = NULL; Message error here.

class Data : public QDialog
{
//...
    public:
    Historic *hs = NULL; Message error here.

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Thanks!