error: ‘viennacl::compressed_matrix<float, 4u> has incomplete type

[Daniel Estrela]

Hi,
I've tried to to declare a compressed matrix in viennacl with this code snnipet:

std::vector< std::map< unsigned int, ScalarType > > std_matrixM;
viennacl::io::read_matrix_market_file(std_matrixM, myoptions.matrixM);
viennacl::compressed_matrix<ScalarType, 4> vcl_matrixM(std_matrixM.size(), std_matrixM.size());

But when I try to compile:

g++ -fpermissive spmv.cpp -lOpenCL -o spmv_viennacl_cpu

I got the error:

error: ‘viennacl::compressed_matrix<float, 4u> vcl_matrixM’ has incomplete type

Thanks in advance for any help,
Daniel Estrela