(no subject)

I’m trying to build the costas loop block…but it showing the
like this while I execute the make command:

/home/lekha/gr-digital/lib/cost_impl.cc: In constructor

‘gr::digital::cost_impl::cost_impl(float, int)’:

/home/lekha/gr-digital/lib/cost_impl.cc:47:15: error: type
‘gr::blocks::control_loop’ is

not a direct or virtual base of ‘gr::digital::cost_impl’

/home/lekha/gr-digital/lib/cost_impl.cc: In member function ‘virtual int

gr::digital::cost_impl::work(int, gr_vector_const_void_star&,

what is problem? thanks for your help.

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