[Discuss-gnuradio] Undefined symbol: wav_write_sample

Hello,

I am developing a block. Now it is a copy of Wav File Sink block.
It compiles fine but in the GRC gives me the error:

ImportError: /usr/local/lib/libgnuradio-MLABlocks.so: undefined symbol: _ZN2gr6blocks16wav_write_sampleEP8_IO_FILEsi

This is the block:

https://github.com/qarlosalberto/wav-sink

*I have done: sudo ldconfig

** I have serched in the mailing list, but I haven't solved the problem.

Thank you.