# Install GNU Radio 3.7.1: Gruel error, where should I replace GNURADIO\_CORE with GNURADIO\_RUNTIME\_?

**URL:** <https://www.ruby-forum.com/t/install-gnu-radio-3-7-1-gruel-error-where-should-i-replace-gnuradio-core-with-gnuradio-runtime/237034>\
**Category:** GNU Radio\
**Created:** [October 21, 2013, 6:47am UTC](https://www.ruby-forum.com/t/install-gnu-radio-3-7-1-gruel-error-where-should-i-replace-gnuradio-core-with-gnuradio-runtime/237034 "2013-10-21T06:47:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [October 21, 2013, 6:47am UTC](https://www.ruby-forum.com/t/install-gnu-radio-3-7-1-gruel-error-where-should-i-replace-gnuradio-core-with-gnuradio-runtime/237034/1 "2013-10-21T06:47:54Z")

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Dear Sir,

I was using GNU Radio 3.6.5.1 but now try migrating to version 3.7.1.  
So I  
remove all existing installation, then start using the latest  
“build-gnuradio” script.  
This error comes out:

Building extra module gr-baz  
– The CXX compiler identification is GNU 4.7.2  
– The C compiler identification is GNU 4.7.2  
– Check for working CXX compiler: /usr/bin/c++  
– Check for working CXX compiler: /usr/bin/c++ – works  
– Detecting CXX compiler ABI info  
– Detecting CXX compiler ABI info - done  
– Check for working C compiler: /usr/bin/gcc  
– Check for working C compiler: /usr/bin/gcc – works  
– Detecting C compiler ABI info  
– Detecting C compiler ABI info - done  
– Build type not specified: defaulting to release.  
– Boost version: 1.49.0  
– Found the following Boost libraries:  
– system  
– thread  
– Found PkgConfig: /usr/bin/pkg-config (found version “0.26”)  
– checking for module ‘gruel’  
– package ‘gruel’ not found  
– Could NOT find GRUEL (missing: GRUEL\_LIBRARIES GRUEL\_INCLUDE\_DIRS)  
– checking for module ‘gnuradio-core’  
– package ‘gnuradio-core’ not found  
– Could NOT find GNURADIO\_CORE (missing: GNURADIO\_CORE\_LIBRARIES  
GNURADIO\_CORE\_INCLUDE\_DIRS)  
CMake Error at CMakeLists.txt:135 (message):  
Gruel required to compile baz

I know in version 3.7 I need to remove all GRUEL\_ references and replace  
GNURADIO\_CORE variables with GNURADIO\_RUNTIME\_.  
But how to do that? It seems the “build-gnuradio” script starts from  
scratch and it automatically uninstall libgruel3.5.3.2 installed by me.

Thanks in advance.  
Regards,  
sgku