Hi Tushar - Is the error when compiling your "receiver.cpp", or when linking? 
What is the complete error and command issued that generates this error? - MLD

On Sat, Jun 15, 2019, at 3:47 AM, tushar sharma wrote:
> /home/msi52/src/applications/newpackage/receiver.cpp:-1: error: undefined 
> reference to `gr::bb60c::source::make()' 
> <https://stackoverflow.com/questions/56608254/home-msi52-src-applications-newpackage-receiver-cpp-1-error-undefined-refere>

> 
> 
> I am trying to use one of the blocks from an OOT module in another package. 
> But it gives me this undefined reference error on make.

> I assume this pertains to linking of the OOT module code. So I have tried 
> adding the OOT module to the find_package in Cmakelists of the new package 
> and created a .pc for it to be found by pkg config module. But still the 
> error remains.

> 

> 

> `#include <bb60c/source.h>  //header for my OOT module

gr::bb60c::source::sptr     src1;  //the pointer declared in the .h file of my 
new package. It gives no error

src1=gr::bb60c::source::make(1e9, -20, -1, -1, 2, 18e6, false, false, 0, 0); 
//the make for the block in .cc file of my package which gives this error

find_package(Gnuradio-bb60c REQUIRED) // find package in the Cmake lists

> /***Contents of .pc file created*****/
INCLUDE(FindPkgConfig)
PKG_CHECK_MODULES(PC_BB60C bb60c)

FIND_PATH(
    BB60C_INCLUDE_DIRS
    NAMES bb60c/api.h
    HINTS $ENV{BB60C_DIR}/include
        ${PC_BB60C_INCLUDEDIR}
    PATHS ${CMAKE_INSTALL_PREFIX}/include
          /usr/local/include
          /usr/include
> )

FIND_LIBRARY(
    BB60C_LIBRARIES
    NAMES gnuradio-bb60c
    HINTS $ENV{BB60C_DIR}/lib
        ${PC_BB60C_LIBDIR}
    PATHS ${CMAKE_INSTALL_PREFIX}/lib
          ${CMAKE_INSTALL_PREFIX}/lib64
          /usr/local/lib
          /usr/local/lib64
          /usr/lib
          /usr/lib64
> )
> 
> `INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(BB60C DEFAULT_MSG BB60C_LIBRARIES 
BB60C_INCLUDE_DIRS)
MARK_AS_ADVANCED(BB60C_LIBRARIES BB60C_INCLUDE_DIRS)
> /************************************/``
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