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Vasil Velichkov vvvelichkov at gmail.comHi Thangaraj, On 11/11/2021 10.39, Thangaraj Mukara Dhakshinamoorthy wrote: > GNU Radio version: 3.8.1.0 How did you install gnuradio - with the package manager or from source? > > I tried to build osmocom block in my existing gnuradio environment Which gr-osmosdr version are you trying to install? > -- Checking for module 'gruel' > -- No package 'gruel' found > -- Could NOT find GRUEL (missing: GRUEL_LIBRARIES GRUEL_INCLUDE_DIRS) > CMake Error at CMakeLists.txt:166 (message): > Gruel required to build gr-osmosdr This error indicates you are trying to install an older version that is compatible with gnuradio 3.7 but not with 3.8 > What am I missing here? I installed the required RTL-SDR packages too! For gnuradio 3.8 you need to build the latest version of gr3.8 branch [1] or version 0.2.3 [2]. In case you have install gnuradio from the Ubuntu's repository you can install gr-osmosdr from there as well - sudo apt-get install gr-osmosdr [1] https://github.com/osmocom/gr-osmosdr/tree/gr3.8 [2] https://github.com/osmocom/gr-osmosdr/archive/refs/tags/v0.2.3.tar.gz Regards, Vasil