Hi Tom,

I have a similar problem. I added a pretty plain block, which uses #include 
<gnuradio/blocks/pdu.h> and changed my set() according to your description to
set(GR_REQUIRED_COMPONENTS RUNTIME BLOCKS PMT PDU)

All compiles well, but the same error as in this thread.

Do you have a clue, what I am missing?

Regards
Stephan

>When you build an OOT module, it only knows to look for and link against the 
>GNU Radio runtime library. If you look in the top-level CMakeLists.txt file of 
>your project, you'll
> see a line (somewhere around line 113) that declares this:

> set(GR_REQUIRED_COMPONENTS RUNTIME)

> But now you are trying to use an FFT filter, which is in the GNU Radio filter 
> library (libgnuradio-filter). You need to tell the project to both find and 
> link against this library now,
> so change that line to:

> set(GR_REQUIRED_COMPONENTS RUNTIME FILTER)

> For future reference, nearly this exact problem is mentioned in out OOT 
> configuration tutorial:

> http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig

> Tom

Mit freundlichen Grüßen / Best regards

Stephan Ludwig

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