Just a wild  guess, is swig installed?

James, What are the changes that you made? An undefined symbol suggests the compiler has built code referring to another object, but the linker was unable to find that object. Did you add new files to the ./lib directory? If so, you need to edit CMakeList.txt and then delete/recreate the build directory using cmake.

James, Can you also post your test.tsv file and elaborate on the specific P25 system that you desire to monitor? I have not had any issues with the RTL SDR on OP25 scope.py running under Ubuntu 14.04 using the following command outline to build my system. Let me know if you are running Ubuntu in VirtualBox on a Windows machine as there are a couple of additional pointers that I can pass along. Download and install Ubuntu 14.04 Latest: <http://releases.ubuntu.com/14.04/> http://releases.ubuntu.com/14.04/ sudo apt-get update sudo apt-get build-dep gnuradio sudo apt-get install gnuradio gnuradio-dev gr-osmosdr librtlsdr-dev libuhd-dev libhackrf-dev libitpp-dev libpcap-dev git cd ~ git clone git://op25.osmocom.org/op25.git cd op25 mkdir build cd build cmake ../ make sudo make install sudo ldconfig sudo nano /etc/modprobe.d/dvb-blacklist.conf blacklist r820t ;blacklist rtl2832 blacklist rtl2830 blacklist dvb_usb_rtl28xxu # ctrl+x to save and exit sudo cp /etc/pulse/client.conf /etc/pulse/client.confbackup sudo nano /etc/pulse/client.conf Edit the following line: From: ; autospawn = yes To: autospawn = no Restart! Create trunk.tsv Create trunkgroup.tsv Create scope.sh cd /home/username/op25/op25/gr-op25_repeater/apps ./scope.py --args rtl=0 -N LNA:46 -f 853.9125e6 -S 2560000-q 0 -V -T trunk.tsv chmod +x scope.sh Bill, WA8WG From: op25-dev(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Thursday, September 21, 2017 7:13 AM To: op25-dev(a)yahoogroups.com Subject: Re: [op25-dev] Undefined Symbol Error Here is the command I was using ./scope.py --args 'rtl' --gains 'lna:44' -f 154732500 -q 1 -S 2000000 -V -T test.tsv Thanks, James On Wed, Sep 20, 2017 at 12:48 PM, 'William Becks' wa8wg(a)centurytel.net [op25-dev] &lt;op25-dev(a)yahoogroups.com&gt; wrote: James, Can you post your scope.py command line as a starting point? Bill, WA8WG From: op25-dev(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Wednesday, September 20, 2017 8:15 AM To: op25-dev(a)yahoogroups.com Subject: [op25-dev] Undefined Symbol Error Hi again all, I'm trying to get the main branch running with some of the changes that Joe incorporated last year. Everything compiles fine (this is a fresh install of Ubuntu 14.04) but when running scope.py I'm getting and undefined symbol error: (most recent call last): File "./scope.py", line 55, in <module> import op25_repeater File "/usr/local/lib/python2.7/dist-packages/op25_repeater/__init__.py", line 45, in <module> from op25_repeater_swig import * File "/usr/local/lib/python2.7/dist-packages/op25_repeater/op25_repeater_swig.py", line 28, in <module> _op25_repeater_swig = swig_import_helper() File "/usr/local/lib/python2.7/dist-packages/op25_repeater/op25_repeater_swig.py", line 24, in swig_import_helper _mod = imp.load_module('_op25_repeater_swig', fp, pathname, description) ImportError: /usr/local/lib/libgnuradio-op25_repeater.so: undefined symbol: _ZN8p25p2_vf12encode_dstarEPhPKi Searching around for this does not turn up anything really. Has anyone seen this before? Thanks, James

James, If you build/rebuild following the command steps below there should not have any errors getting scope.py to run at all. I have built several instances of OP25 following that outline and it always works first time, every time. Bill From: op25-dev(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Thursday, September 21, 2017 8:44 AM To: op25-dev(a)yahoogroups.com Subject: Re: [op25-dev] Undefined Symbol Error Bill, Everything works fine with the main branch of OP25. However I am trying to incorporate some of the changes Joe made to the code a year ago or so. After putting his changed files into the lib directory op25 compiled fine. But when I run scope.py I get the error I posted earlier about an Undefined Symbol. I don't know much about python or swig so I'm hoping someone on the list was able to incorporate his changes somehow and let me know what they did. Thanks for your help. James On Thu, Sep 21, 2017 at 9:39 AM, 'William Becks' wa8wg(a)centurytel.net [op25-dev] &lt;op25-dev(a)yahoogroups.com&gt; wrote: James, Can you also post your test.tsv file and elaborate on the specific P25 system that you desire to monitor? I have not had any issues with the RTL SDR on OP25 scope.py running under Ubuntu 14.04 using the following command outline to build my system. Let me know if you are running Ubuntu in VirtualBox on a Windows machine as there are a couple of additional pointers that I can pass along. Download and install Ubuntu 14.04 Latest: <http://releases.ubuntu.com/14.04/> http://releases.ubuntu.com/14.04/ sudo apt-get update sudo apt-get build-dep gnuradio sudo apt-get install gnuradio gnuradio-dev gr-osmosdr librtlsdr-dev libuhd-dev libhackrf-dev libitpp-dev libpcap-dev git cd ~ git clone git://op25.osmocom.org/op25.git cd op25 mkdir build cd build cmake ../ make sudo make install sudo ldconfig sudo nano /etc/modprobe.d/dvb-blacklist.conf blacklist r820t ;blacklist rtl2832 blacklist rtl2830 blacklist dvb_usb_rtl28xxu # ctrl+x to save and exit sudo cp /etc/pulse/client.conf /etc/pulse/client.confbackup sudo nano /etc/pulse/client.conf Edit the following line: From: ; autospawn = yes To: autospawn = no Restart! Create trunk.tsv Create trunkgroup.tsv Create scope.sh cd /home/username/op25/op25/gr-op25_repeater/apps ./scope.py --args rtl=0 -N LNA:46 -f 853.9125e6 -S 2560000-q 0 -V -T trunk.tsv chmod +x scope.sh Bill, WA8WG From: op25-dev(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Thursday, September 21, 2017 7:13 AM To: op25-dev(a)yahoogroups.com Subject: Re: [op25-dev] Undefined Symbol Error Here is the command I was using ./scope.py --args 'rtl' --gains 'lna:44' -f 154732500 -q 1 -S 2000000 -V -T test.tsv Thanks, James On Wed, Sep 20, 2017 at 12:48 PM, 'William Becks' wa8wg(a)centurytel.net [op25-dev] &lt;op25-dev(a)yahoogroups.com&gt; wrote: James, Can you post your scope.py command line as a starting point? Bill, WA8WG From: op25-dev(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Wednesday, September 20, 2017 8:15 AM To: op25-dev(a)yahoogroups.com Subject: [op25-dev] Undefined Symbol Error Hi again all, I'm trying to get the main branch running with some of the changes that Joe incorporated last year. Everything compiles fine (this is a fresh install of Ubuntu 14.04) but when running scope.py I'm getting and undefined symbol error: (most recent call last): File "./scope.py", line 55, in <module> import op25_repeater File "/usr/local/lib/python2.7/dist-packages/op25_repeater/__init__.py", line 45, in <module> from op25_repeater_swig import * File "/usr/local/lib/python2.7/dist-packages/op25_repeater/op25_repeater_swig.py", line 28, in <module> _op25_repeater_swig = swig_import_helper() File "/usr/local/lib/python2.7/dist-packages/op25_repeater/op25_repeater_swig.py", line 24, in swig_import_helper _mod = imp.load_module('_op25_repeater_swig', fp, pathname, description) ImportError: /usr/local/lib/libgnuradio-op25_repeater.so: undefined symbol: _ZN8p25p2_vf12encode_dstarEPhPKi Searching around for this does not turn up anything really. Has anyone seen this before? Thanks, James