I'm trying to make an out of tree module based on blocks::file_sink that has 
some additional functionality I need. Right now, I've built it OOT, but an 
having trouble getting it to work. The code (file_sink_impl.cc, 
file_sink_impl.h, and file_sink.h --> actual names are different so there are 
no conflicts) are all identical to the ones in tree. I used gr-modtool to 
create the OOT modules with this block and it makes and installs fine. However, 
when I try to use it, I get the following error:

AttributeError: 'file_sink_sptr' object has no attribute 'set_unbuffered'

What I think is happening here is that the OOT version of my code isn't linking 
to the file_sink_base in gnuradio-blocks to inherit this function. Browsing 
previous mail lists, Marcus Muller noted in the thread ' [Discuss-gnuradio] Out 
of Tree linker error... libgnuradio-MYMOD.so:' that the problem might be in my 
cmake files. He referenced gr-specest as an example which uses in tree modules. 
I compared the cmakelists.txt in gr-specest to the OOT module directory and in 
the OOT/lib directory and added the BLOCKS references in the appropriate 
places. However, this still hasn't solved the problems.
Are there any other steps necessary to make and install an OOT modules with in 
tree dependencies?

All of this is running on Ubuntu 14.04LTS with gnuradio 3.7.7.1
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