[Discuss-gnuradio] Undefined reference gr::blocks::count_bits8

[Tzougkarakis Antonis]

Hello,

I have an OOT module which I have created with gr_modtool and I want to 
use the function count_bits_8  and count_bits_16 from 
gnuradio/blocks/count_bits.h. I have included the library in my c++ file 
but when I try to compile it I get the following message:

[ 80%] Linking CXX executable test-ieee802_15_4g_testing
libgnuradio-ieee802_15_4g_testing-1.0.0git.so.0.0.0: undefined reference 
to `gr::blocks::count_bits8(unsigned int)'
libgnuradio-ieee802_15_4g_testing-1.0.0git.so.0.0.0: undefined reference 
to `gr::blocks::count_bits16(unsigned int)'
collect2: error: ld returned 1 exit status
lib/CMakeFiles/test-ieee802_15_4g_testing.dir/build.make:130: recipe for 
target 'lib/test-ieee802_15_4g_testing' failed
make[2]: *** [lib/test-ieee802_15_4g_testing] Error 1
CMakeFiles/Makefile2:137: recipe for target 
'lib/CMakeFiles/test-ieee802_15_4g_testing.dir/all' failed
make[1]: *** [lib/CMakeFiles/test-ieee802_15_4g_testing.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 80%] Built target ieee802_15_4g_testing_swig_swig_2d0df
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2

I know that it is a link error but I don't know what addition I should 
do in order to fix the error. Any help would be appreciated.

Thank you.