# Gr\_modtool

**URL:** <https://www.ruby-forum.com/t/gr-modtool/239591>\
**Category:** GNU Radio\
**Created:** [March 6, 2014, 2:47am UTC](https://www.ruby-forum.com/t/gr-modtool/239591 "2014-03-06T02:47:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [March 6, 2014, 2:47am UTC](https://www.ruby-forum.com/t/gr-modtool/239591/1 "2014-03-06T02:47:44Z")

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hi  
i use gr\_modtool to add a new block in an exist module,it apper this :

No GNU Radio module found in the given directory. Quitting.

what shoud i do to solve it  
thanks,  
BZS

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [March 6, 2014, 8:45am UTC](https://www.ruby-forum.com/t/gr-modtool/239591/2 "2014-03-06T08:45:04Z")

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Hi BZS!

Your question is very vague. Please do make sure to include what you  
actually did (in commands, where you executed them, where your module  
comes from…) and what you’ve tried to solve your problem yourself,  
otherwise we will a) don’t know what’s the problem and b) feel like  
we’re actually solving problems that you, with a little more trying,  
could have solved yourself ;).

Our guide on reporting errors is:  
[http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors](http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors)  
Please adhere to that!

Greetings,  
Marcus

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [March 7, 2014, 2:14am UTC](https://www.ruby-forum.com/t/gr-modtool/239591/3 "2014-03-07T02:14:44Z")

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gr\_modtool looks for a known module structure.  
If your module doesn’t have that specific structure or keywords in its  
CMakeLists.txt, maybe because it was not generated by gr\_modtool, the  
build system has been modified, it’s for a different GNU Radio version  
etc.

Greetings,  
Marcus