Hi, I build gr-osmocom + XTRX again. And compile successfully But when I run osmocom_fft : osmocom_fft -F -f 850e6 -s 4e6 Traceback (most recent call last):   File "/usr/local/bin/osmocom_fft", line 23, in <module>     import osmosdr ModuleNotFoundError: No module named 'osmosdr' clone gr-osmosdr from https://github.com/osmocom/gr-osmosdr <https://github.com/osmocom/gr-osmosdr>  Try master and gr-3.8 branch, get the same result gnuradio-config-info -v 3.8.2.0 output of cmake: cmake .. -- Build type not specified: defaulting to release. -- Checking for module 'gmp' --   No package 'gmp' found -- Checking for module 'mpir >= 3.0' --   No package 'mpir' found -- Could NOT find MPIR (missing: MPIRXX_LIBRARY MPIR_LIBRARY MPIR_INCLUDE_DIR) -- Boost version: 1.65.1 -- Found the following Boost libraries: --   date_time --   program_options --   filesystem --   system --   regex --   thread --   unit_test_framework --   chrono --   atomic -- User set python executable /usr/bin/python3 -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.6m.so <http://libpython3.6m.so> (found suitable exact version "3.6.9") -- Extracting version information from git describe... -- Boost version: 1.65.1 -- Found the following Boost libraries: --   chrono --   thread --   system --   date_time --   atomic -- -- The build system will automatically enable all components. -- Use -DENABLE_DEFAULT=OFF to disable components by default. -- Searching for GNURadio-Blocks... --  Found GNURadio-Blocks: 1 -- Searching for IQ Balance... -- Could NOT find gnuradio-iqbalance (missing: gnuradio-iqbalance_DIR) --  Found IQ Balance: 0 -- Searching for UHD Drivers... --  Found UHD Driver: TRUE -- Searching for UHD Block... --  Found UHD Block: 1 -- Searching for Volk... --  Found Volk: 1 -- Checking for module 'libairspyhf' --   No package 'libairspyhf' found -- Could NOT find LIBAIRSPYHF (missing: LIBAIRSPYHF_LIBRARIES LIBAIRSPYHF_INCLUDE_DIRS) -- Checking for module 'libgnuradio-fcdproplus' --   No package 'libgnuradio-fcdproplus' found -- gnuradio-fcdproplus not found. -- Checking for module 'libfreesrp' --   No package 'libfreesrp' found -- libfreesrp not found. -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.6m.so <http://libpython3.6m.so> (found suitable version "3.6.9", minimum required is "3") -- -- Checking for module SWIG -- Found SWIG version 3.0.12. -- Minimum SWIG version required is 1.3.31 -- -- Configuring Python support support... --   Dependency PYTHONLIBS_FOUND = TRUE --   Dependency SWIG_FOUND = TRUE --   Dependency SWIG_VERSION_CHECK = TRUE --   Enabling Python support support. --   Override with -DENABLE_PYTHON=ON/OFF CMake Warning (dev) in lib/CMakeLists.txt:   A logical block opening on the line     /home/init3/SDR/gr-osmosdr/lib/CMakeLists.txt:45 (MACRO)   closes on the line     /home/init3/SDR/gr-osmosdr/lib/CMakeLists.txt:47 (ENDMACRO)   with mis-matching arguments. This warning is for project developers.  Use -Wno-dev to suppress it. You have called ADD_LIBRARY for library gnuradio-osmosdr without any source files. This typically indicates a problem with your CMakeLists.txt file -- -- Configuring high resolution timing... --   High resolution timing supported through clock_gettime. -- -- Configuring Osmocom IQ Imbalance Correction support... --   Dependency gnuradio-iqbalance_FOUND = 0 --   Disabling Osmocom IQ Imbalance Correction support. --   Override with -DENABLE_IQBALANCE=ON/OFF -- -- Configuring FUNcube Dongle support... --   Dependency GNURADIO_FCDPP_FOUND = FALSE --   Disabling FUNcube Dongle support. --   Override with -DENABLE_FCD=ON/OFF -- -- Configuring IQ File Source & Sink support... --   Dependency gnuradio-blocks_FOUND = 1 --   Enabling IQ File Source & Sink support. --   Override with -DENABLE_FILE=ON/OFF -- -- -- Configuring Osmocom RTLSDR support... --   Dependency LIBRTLSDR_FOUND = TRUE --   Enabling Osmocom RTLSDR support. --   Override with -DENABLE_RTL=ON/OFF -- -- Configuring RTLSDR TCP Client support... --   Dependency gnuradio-blocks_FOUND = 1 --   Enabling RTLSDR TCP Client support. --   Override with -DENABLE_RTL_TCP=ON/OFF -- -- Configuring Ettus USRP Devices support... --   Dependency UHD_FOUND = TRUE --   Dependency gnuradio-uhd_FOUND = 1 --   Enabling Ettus USRP Devices support. --   Override with -DENABLE_UHD=ON/OFF -- -- Configuring HackRF & rad1o Badge support... --   Dependency LIBHACKRF_FOUND = TRUE --   Enabling HackRF & rad1o Badge support. --   Override with -DENABLE_HACKRF=ON/OFF -- -- Configuring nuand bladeRF support... --   Dependency LIBBLADERF_FOUND = TRUE --   Enabling nuand bladeRF support. --   Override with -DENABLE_BLADERF=ON/OFF -- -- Configuring RFSPACE Receivers support... --   Enabling RFSPACE Receivers support. --   Override with -DENABLE_RFSPACE=ON/OFF -- -- Configuring AIRSPY Receiver support... --   Dependency LIBAIRSPY_FOUND = TRUE --   Enabling AIRSPY Receiver support. --   Override with -DENABLE_AIRSPY=ON/OFF -- -- Configuring AIRSPY HF+ Receiver support... --   Dependency LIBAIRSPYHF_FOUND = FALSE --   Disabling AIRSPY HF+ Receiver support. --   Override with -DENABLE_AIRSPYHF=ON/OFF -- -- Configuring SoapySDR support support... --   Dependency SoapySDR_FOUND = 1 --   Enabling SoapySDR support support. --   Override with -DENABLE_SOAPY=ON/OFF -- -- Configuring Red Pitaya SDR support... --   Enabling Red Pitaya SDR support. --   Override with -DENABLE_REDPITAYA=ON/OFF -- -- Configuring FreeSRP support support... --   Dependency LIBFREESRP_FOUND = FALSE --   Disabling FreeSRP support support. --   Override with -DENABLE_FREESRP=ON/OFF -- -- Configuring XTRX SDR support... --   Dependency LIBXTRX_FOUND = TRUE --   Enabling XTRX SDR support. --   Override with -DENABLE_XTRX=ON/OFF -- -- ###################################################### -- # Gnuradio enabled components -- ###################################################### --   * Python support --   * IQ File Source & Sink --   * Osmocom RTLSDR --   * RTLSDR TCP Client --   * Ettus USRP Devices --   * HackRF & rad1o Badge --   * nuand bladeRF --   * RFSPACE Receivers --   * AIRSPY Receiver --   * SoapySDR support --   * Red Pitaya SDR --   * XTRX SDR -- -- ###################################################### -- # Gnuradio disabled components -- ###################################################### --   * Osmocom IQ Imbalance Correction --   * FUNcube Dongle --   * AIRSPY HF+ Receiver --   * FreeSRP support -- -- Building for version: 0.2.0.0 / 0.2.0 -- Using install prefix: /usr/local -- Configuring done -- Generating done -- Build files have been written to: /home/init3/SDR/gr-osmosdr/build Clayton Smith &lt;argilo(a)gmail.com <mailto:argilo@gmail.com>> 于2021年1月18日周一 下午10:10写道： Are you using the latest version of libxtrx? The xtrx_open_list function was removed from its API a couple years ago and replaced with xtrx_open_string. I recently updated gr-osmosdr to use the new function. On Mon, Jan 18, 2021 at 8:43 AM 雪碧 0xroot &lt;renxianyuanqi(a)gmail.com <mailto:renxianyuanqi@gmail.com>> wrote: Dear  osmocom community, I am using XTRX + gr-osmosdr on ubuntu 18 when i try to build gr-osmosdr : [ 81%] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/redpitaya/redpitaya_sink_c.cc.o [ 83%] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/redpitaya/redpitaya_common.cc.o [ 85%] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/xtrx/xtrx_obj.cc.o [ 87%] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/xtrx/xtrx_source_c.cc.o /home/init3/SDR/gr-osmosdr/lib/xtrx/xtrx_obj.cc: In constructor ‘xtrx_obj::xtrx_obj(const string&, unsigned int, bool)’: /home/init3/SDR/gr-osmosdr/lib/xtrx/xtrx_obj.cc:71:13: error: ‘xtrx_open_string’ was not declared in this scope    int res = xtrx_open_string(path.c_str(), &_obj);              ^~~~~~~~~~~~~~~~ /home/init3/SDR/gr-osmosdr/lib/xtrx/xtrx_obj.cc:71:13: note: suggested alternative: ‘xtrx_open_list’    int res = xtrx_open_string(path.c_str(), &_obj);              ^~~~~~~~~~~~~~~~              xtrx_open_list lib/CMakeFiles/gnuradio-osmosdr.dir/build.make:662: recipe for target 'lib/CMakeFiles/gnuradio-osmosdr.dir/xtrx/xtrx_obj.cc.o' failed make[2]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/xtrx/xtrx_obj.cc.o] Error 1 make[2]: *** 正在等待未完成的任务.... CMakeFiles/Makefile2:167: recipe for target 'lib/CMakeFiles/gnuradio-osmosdr.dir/all' failed make[1]: *** [lib/CMakeFiles/gnuradio-osmosdr.dir/all] Error 2 Makefile:140: recipe for target 'all' failed make: *** [all] Error 2 Info: gnuradio 3.8.2.0 gr-osmosdr gr-3.8 How to fix it? cmake output: cmake .. -- Build type not specified: defaulting to release. -- Checking for module 'gmp' --   No package 'gmp' found -- Checking for module 'mpir >= 3.0' --   No package 'mpir' found -- Could NOT find MPIR (missing: MPIRXX_LIBRARY MPIR_LIBRARY MPIR_INCLUDE_DIR) -- Boost version: 1.65.1 -- Found the following Boost libraries: --   date_time --   program_options --   filesystem --   system --   regex --   thread --   unit_test_framework --   chrono --   atomic -- User set python executable /usr/bin/python3.6 -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.6m.so <http://libpython3.6m.so> (found suitable exact version "3.6.9") -- Extracting version information from git describe... -- Boost version: 1.65.1 -- Found the following Boost libraries: --   chrono --   thread --   system --   date_time --   atomic -- -- The build system will automatically enable all components. -- Use -DENABLE_DEFAULT=OFF to disable components by default. -- Searching for GNURadio-Blocks... --  Found GNURadio-Blocks: 1 -- Searching for IQ Balance... -- Could NOT find gnuradio-iqbalance (missing: gnuradio-iqbalance_DIR) --  Found IQ Balance: 0 -- Searching for UHD Drivers... --  Found UHD Driver: TRUE -- Searching for UHD Block... --  Found UHD Block: 1 -- Searching for Volk... --  Found Volk: 1 -- Checking for module 'libairspyhf' --   No package 'libairspyhf' found -- Could NOT find LIBAIRSPYHF (missing: LIBAIRSPYHF_LIBRARIES LIBAIRSPYHF_INCLUDE_DIRS) -- Checking for module 'libgnuradio-fcdproplus' --   No package 'libgnuradio-fcdproplus' found -- gnuradio-fcdproplus not found. -- Checking for module 'libfreesrp' --   No package 'libfreesrp' found -- libfreesrp not found. -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.6m.so <http://libpython3.6m.so> (found suitable version "3.6.9", minimum required is "3") -- -- Checking for module SWIG -- Found SWIG version 3.0.12. -- Minimum SWIG version required is 1.3.31 -- -- Configuring Python support support... --   Dependency PYTHONLIBS_FOUND = TRUE --   Dependency SWIG_FOUND = TRUE --   Dependency SWIG_VERSION_CHECK = TRUE --   Enabling Python support support. --   Override with -DENABLE_PYTHON=ON/OFF CMake Warning (dev) in lib/CMakeLists.txt:   A logical block opening on the line     /home/init3/SDR/gr-osmosdr/lib/CMakeLists.txt:45 (MACRO)   closes on the line     /home/init3/SDR/gr-osmosdr/lib/CMakeLists.txt:47 (ENDMACRO)   with mis-matching arguments. This warning is for project developers.  Use -Wno-dev to suppress it. You have called ADD_LIBRARY for library gnuradio-osmosdr without any source files. This typically indicates a problem with your CMakeLists.txt file -- -- Configuring high resolution timing... --   High resolution timing supported through clock_gettime. -- -- Configuring Osmocom IQ Imbalance Correction support... --   Dependency gnuradio-iqbalance_FOUND = 0 --   Disabling Osmocom IQ Imbalance Correction support. --   Override with -DENABLE_IQBALANCE=ON/OFF -- -- Configuring FUNcube Dongle support... --   Dependency GNURADIO_FCDPP_FOUND = FALSE --   Disabling FUNcube Dongle support. --   Override with -DENABLE_FCD=ON/OFF -- -- Configuring IQ File Source & Sink support... --   Dependency gnuradio-blocks_FOUND = 1 --   Enabling IQ File Source & Sink support. --   Override with -DENABLE_FILE=ON/OFF -- -- -- Configuring Osmocom RTLSDR support... --   Dependency LIBRTLSDR_FOUND = TRUE --   Enabling Osmocom RTLSDR support. --   Override with -DENABLE_RTL=ON/OFF -- -- Configuring RTLSDR TCP Client support... --   Dependency gnuradio-blocks_FOUND = 1 --   Enabling RTLSDR TCP Client support. --   Override with -DENABLE_RTL_TCP=ON/OFF -- -- Configuring Ettus USRP Devices support... --   Dependency UHD_FOUND = TRUE --   Dependency gnuradio-uhd_FOUND = 1 --   Enabling Ettus USRP Devices support. --   Override with -DENABLE_UHD=ON/OFF -- -- Configuring HackRF & rad1o Badge support... --   Dependency LIBHACKRF_FOUND = TRUE --   Enabling HackRF & rad1o Badge support. --   Override with -DENABLE_HACKRF=ON/OFF -- -- Configuring nuand bladeRF support... --   Dependency LIBBLADERF_FOUND = TRUE --   Enabling nuand bladeRF support. --   Override with -DENABLE_BLADERF=ON/OFF -- -- Configuring RFSPACE Receivers support... --   Enabling RFSPACE Receivers support. --   Override with -DENABLE_RFSPACE=ON/OFF -- -- Configuring AIRSPY Receiver support... --   Dependency LIBAIRSPY_FOUND = TRUE --   Enabling AIRSPY Receiver support. --   Override with -DENABLE_AIRSPY=ON/OFF -- -- Configuring AIRSPY HF+ Receiver support... --   Dependency LIBAIRSPYHF_FOUND = FALSE --   Disabling AIRSPY HF+ Receiver support. --   Override with -DENABLE_AIRSPYHF=ON/OFF -- -- Configuring SoapySDR support support... --   Dependency SoapySDR_FOUND = 1 --   Enabling SoapySDR support support. --   Override with -DENABLE_SOAPY=ON/OFF -- -- Configuring Red Pitaya SDR support... --   Enabling Red Pitaya SDR support. --   Override with -DENABLE_REDPITAYA=ON/OFF -- -- Configuring FreeSRP support support... --   Dependency LIBFREESRP_FOUND = FALSE --   Disabling FreeSRP support support. --   Override with -DENABLE_FREESRP=ON/OFF -- -- Configuring XTRX SDR support... --   Dependency LIBXTRX_FOUND = TRUE --   Enabling XTRX SDR support. --   Override with -DENABLE_XTRX=ON/OFF -- -- ###################################################### -- # Gnuradio enabled components -- ###################################################### --   * Python support --   * IQ File Source & Sink --   * Osmocom RTLSDR --   * RTLSDR TCP Client --   * Ettus USRP Devices --   * HackRF & rad1o Badge --   * nuand bladeRF --   * RFSPACE Receivers --   * AIRSPY Receiver --   * SoapySDR support --   * Red Pitaya SDR --   * XTRX SDR -- -- ###################################################### -- # Gnuradio disabled components -- ###################################################### --   * Osmocom IQ Imbalance Correction --   * FUNcube Dongle --   * AIRSPY HF+ Receiver --   * FreeSRP support -- -- Building for version: 0.2.0.0 / 0.2.0 -- Using install prefix: /usr/local -- Configuring done -- Generating done -- Build files have been written to: /home/init3/SDR/gr-osmosdr/build -------------------------- Thanks