[Discuss-gnuradio] Problem using FFT-class in my own written block

[jeroen]

Hi all,

I wrote my own block in C++, and used gr-modtool to do all the 'things' 
around it as described in the tutorial "Out-of-tree modules".

I included 'fft/fft.h' in the C++ source code of the block, and used the 
class 'fft_complex'. Then after:

   cmake ../
   make

everything compiles/builds without error, and after:

   make install

the block is available in GNU Radio Companion.

However, when trying to run a design using this block, I get the 
following error:

   ImportError /usr/local/libgnuradio-MY_MODULE.so: undefined symbol: 
fft_complex

I tried executing "sudo ldconfig" but this doesn't solve the problem. 
So, does anybody know how to solve this? Please note:

   * I use a USB-stick environment by Ettus Research, GNU C++ version 
4.7.2
   * I am an absolute beginner regarding Linux and GNU Radio etc. So if 
files need to be modified please let me know which files, where it 
should (can) be located etc...

Thanks for reading,

   Jeroen