Missing Blocks In The Example RFNoC Replay Application In GNURadio

Updated Sep 10, 2026

Issue Details

The example application rfnoc_replay.grc located in /gr-uhd/examples/grc/ directory in GNU Radio 3.11 has missing "uhd_msg_push_button" blocks.

Solution

This is a known issue. The bug fix is tracked in the following link: uhd: cmake: Fix PyQt5 module check by mbr0wn · Pull Request #8153 · gnuradio/gnuradio
The current workaround for this issue is adding additional -DPYQT5_FOUND=ON flag when building GNU Radio from source.

Example Command:

cmake .. -DPYQT5_FOUND=ON <other flags>

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