Install GNU Radio 3.7.1: Gruel error, where should I replace GNURADIO_CORE with GNURADIO_RUNTIME_?

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