# Fwd: configuration incomplete , errors occur!

**URL:** <https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862>\
**Category:** GNU Radio\
**Created:** [May 3, 2014, 10:36am UTC](https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862 "2014-05-03T10:36:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 3, 2014, 10:36am UTC](https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862/1 "2014-05-03T10:36:23Z")

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Hello Sara,  
this is very strange. It looks like there’s an extra module (that you  
shouldn’t be rebuilding, anyway) which tries to find an old version of  
GNU  
Radio. Can you tell us which module that is?

You should realize what your doing here: you download the build-gnuradio  
script anew, and then call it two times… that’s one download and one  
execution too many.

The pupose of the build-gnuradio script is to fetch the source code and  
install all requirement, and in the end build GNU Radio and install it.  
Since you’re modifying the source code, this might _not_ be what you  
want.

What you should be doing is going into your existing gnuradio/build  
directory, and do a “make -j3”[1], “sudo make install”. This should be  
faster. Please check that your modifications are still around before,  
build-gnuradio might have overwritten them.  
Again, please have a look at  
[http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide](http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide) .

In the other thread you asked what you can do to understand the C++  
code;  
my suggestion here is going through  
[http://gnuradio.org/redmine/projects/gnuradio/wiki/Tutorials](http://gnuradio.org/redmine/projects/gnuradio/wiki/Tutorials) ,  
especially  
the “core concepts” and the “developing out-of-tree modules” tutorial,  
as  
well as “how to debug”. I think the problem lies usually less in the C++  
code but in the complexity brought on by a complex framework such as GNU  
Radio and by a complex task such as doing OFDM synchronization in  
software  
– it’s very important you get a feeling of what the system is doing  
(and  
what you are doing with the system) before trying to understand the C++  
code in isolation.

Hope that helped a little,  
Greetings,  
Marcus

[1] or something, the -j parameters tells make how many things to do in  
parallel. As a rule of thumb: Number of CPU cores + 1

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**Author:** ![Marcus\_MS\_ller](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/5daacb/32.png) [@Marcus\_MS\_ller](https://www.ruby-forum.com/u/Marcus_MS_ller)\
**Post date:** [May 3, 2014, 11:31am UTC](https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862/2 "2014-05-03T11:31:03Z")

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On 05/03/2014 10:35 AM, Marcus M. wrote:

> Hello Sara,  
> this is very strange. It looks like there’s an extra module (that you  
> shouldn’t be rebuilding, anyway) which tries to find an old version of  
> GNU Radio. Can you tell us which module that is?

Looks like it’s grextras. You don’t need that.

> [1] or something, the -j parameters tells make how many things to do in  
> parallel. As a rule of thumb: Number of CPU cores + 1

I usually use less. Sometimes, I just want some space left to do other  
things, but parallel swigging can also seriously eat into your RAM, and  
cause swapping.

Martin