[Discuss-gnuradio] Build C++ processing blocks with input parameters

I have been trying to build an easy block called mutiply_ff, having an
input parameter int multiple. The block is meant to multiply each
element of the input streams by the parameter multiple.

I am getting one error when:

mkdir build
cd build
cmake ../
make (Here I get ERROR!)

This is the error:

[ 5%] Building CXX object
lib/CMakeFiles/gnuradio-gabri.dir/multiply_ff_impl.cc.o
In file included from
/home/comlab/Desktop/Gabri/mimo/gr-gabri/lib/multiply_ff_impl.h:24:0,
from
/home/comlab/Desktop/Gabri/mimo/gr-gabri/lib/multiply_ff_impl.cc:26:
/home/comlab/Desktop/Gabri/mimo/gr-gabri/include/gabri/multiply_ff.h:49:24:
error: 'multiple' has not been declared
static sptr make(multiple);
^
/home/comlab/Desktop/Gabri/mimo/gr-gabri/lib/multiply_ff_impl.cc:31:23:
error: prototype for 'gr::gabri::multiply_ff::sptr
gr::gabri::multiply_ff::make(unsigned int)' does not match any in class
'gr::gabri::multiply_ff'
multiply_ff::sptr multiply_ff::make(unsigned multiple)
^
In file included from
/home/comlab/Desktop/Gabri/mimo/gr-gabri/lib/multiply_ff_impl.h:24:0,
from
/home/comlab/Desktop/Gabri/mimo/gr-gabri/lib/multiply_ff_impl.cc:26:
/home/comlab/Desktop/Gabri/mimo/gr-gabri/include/gabri/multiply_ff.h:49:19:
error: candidate is: static gr::gabri::multiply_ff::sptr
gr::gabri::multiply_ff::make(int)
static sptr make(multiple);
^
make[2]: *** [lib/CMakeFiles/gnuradio-gabri.dir/multiply_ff_impl.cc.o]
Error 1
make[1]: *** [lib/CMakeFiles/gnuradio-gabri.dir/all] Error 2
make: *** [all] Error 2

I attach the lib files where the function is implemented.
Any help or tip is welcome. Thanks in advance.

Attachments:
http://www.ruby-forum.com/attachment/10912/multiply_ff_impl.cc
http://www.ruby-forum.com/attachment/10913/multiply_ff_impl.h

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