UHD won't work with GRC

Dear list,

i somehow can’t get the UHD working with GRC. Detecting an USRP2 with
uhd_find_devices works just fine.
I am building from git (master) (what should include the UHD since
today.
I’m also seeing the gr-uhd directory.)
I think that the issue is with ./configure, because there i can’t find
gr-uhd when ./configure is finished. It prints:


The following components were skipped either because you asked not
to build them or they didn’t pass configuration checks:

usrp2-firmware

These components will not be built.


The following GNU Radio components have been successfully configured:

config
gruel
gnuradio-core
usrp
usrp2
gr-usrp
gr-usrp2
gr-msdd6000
gr-audio-alsa
gr-audio-oss
gr-atsc
gr-cvsd-vocoder
gr-gpio
gr-gsm-fr-vocoder
gr-noaa
gr-pager
gr-radar-mono
gr-radio-astronomy
gr-trellis
gr-video-sdl
gr-wxgui
gr-qtgui
gr-sounder
gr-utils
gnuradio-examples
grc
docs

You my now run the make command to build these components.


The following components were skipped either because you asked not
to build them or they didn’t pass configuration checks:

gcell
gr-gcell
gr-audio-jack
gr-audio-osx
gr-audio-portaudio
gr-audio-windows
gr-comedi

These components will not be built.

Configured GNU Radio release v3.3.1git-144-gf294603d for build.

But gr-uhd is neither in the components that will be build, nor in
those,
that won’t be build.

I also tried ./configure --enable-gr-uhd but that didn’t change a thing
:frowning:

If you got any ideas on how to proceed, please let me know.

Fabian

On Thu, Jan 20, 2011 at 2:51 PM, Fabian K. [email protected]
wrote:

Dear list,

i somehow can’t get the UHD working with GRC. Detecting an USRP2 with
uhd_find_devices works just fine.
I am building from git (master) (what should include the UHD since today.
I’m also seeing the gr-uhd directory.)

The merging of next → master was announced for UHD, not for GNU
Radio. You need:
UHD master branch
GNU Radio next branch
see http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki

gr-usrp2
gr-radio-astronomy
You my now run the make command to build these components.
gr-audio-windows
gr-comedi

These components will not be built.

Configured GNU Radio release v3.3.1git-144-gf294603d for build.

This number is for the master branch. The correct revision id for the
next branch is (was earlier today) v3.3.1git-865-gd429522

But gr-uhd is neither in the components that will be build, nor in those,
that won’t be build.

I also tried ./configure --enable-gr-uhd but that didn’t change a thing :frowning:

If you got any ideas on how to proceed, please let me know.

Aside from using the correct GNU Radio branch (next) you also need to
install UHD first, otherwise the GNU Radio configure script will not
detect it and will skip it.

Alex

First of all, thank you for your advice.
Now i encountered another Problem:
At first i updated UHD via git pull, then i did (from the “build”
directory)
cmake …/
make
make test
sudo make install

everything works fine (well, not everything, but at least the
installation
:wink: ).

Then i went to my gnuradio directory and did:
git checkout next
git clean -xf
git pull

GNU Radio release is now v3.3.1git-865-gd429522b instead of

v3.3.1git-865-gd429522, but this should be newer

export LD_LIBRARY_PATH=$BOOST_PREFIX/lib
./bootstrap
./configure --with-boost=$BOOST_PREFIX

./configure now includes gr-uhd, so this problem is solved. Thanks

again!

make

Then, make fails with:
Making install in swig
make[5]: Betrete Verzeichnis
‘/home/fs/gnuradio-git/gnuradio/usrp/host/swig’
make install-am
make[6]: Betrete Verzeichnis
‘/home/fs/gnuradio-git/gnuradio/usrp/host/swig’
make[6]: *** Keine Regel vorhanden, um das Target usrp_prims.cc,
bentigt von _usrp_prims_la-usrp_prims.lo, zu erstellen. Schluss.
make[6]: Verlasse Verzeichnis
‘/home/fs/gnuradio-git/gnuradio/usrp/host/swig’
make[5]: *** [install] Fehler 2
make[5]: Verlasse Verzeichnis
‘/home/fs/gnuradio-git/gnuradio/usrp/host/swig’
make[4]: *** [install-recursive] Fehler 1
make[4]: Verlasse Verzeichnis ‘/home/fs/gnuradio-git/gnuradio/usrp/host’
make[3]: *** [install-recursive] Fehler 1
make[3]: Verlasse Verzeichnis ‘/home/fs/gnuradio-git/gnuradio/usrp’
make[2]: *** [install] Fehler 2
make[2]: Verlasse Verzeichnis ‘/home/fs/gnuradio-git/gnuradio/usrp’
make[1]: *** [install-recursive] Fehler 1
make[1]: Verlasse Verzeichnis ‘/home/fs/gnuradio-git/gnuradio’
make: *** [install] Fehler 2

Sorry, that it’s in german, heres the translation:
Betrete Verzeichnis = Entering directory
Verlasse Verzeichnis = Leaving directory
Fehler = Error

And the (probably) critical part causing the error:
make[6]: *** Keine Regel vorhanden, um das Target usrp_prims.cc,
bentigt von _usrp_prims_la-usrp_prims.lo, zu erstellen. Schluss.
make[6]: *** No Rule given, for making Target usrp_prims.cc,
needed by _usrp_prims_la-usrp_prims.lo. Ending.

If you (or anyone else) got another hint on how to solve this i would be
really glad.

Thanks again and in advance

Fabian

Hi Fabian,

Did you set the PYTHONPATH?
It should be set to PREFIX/lib/python2.6/site-packages where PREFIX is
whatever you have specified during “./configure --prefix=…”
(/usr/local if you haven’t specified anything). Check the directory,
there should be a subdirectory called gnuradio and one called
grc_gnuradio.

A few other notes:

It seems you have two UHD installations:

./usr/local/lib/libuhd.so
./opt/uhd/lib/libuhd.so
You should uninstall one of them (btw. is there really a ‘.’ in the
path’s above?)

You should not specify multiple locations for the installed libraries,
i.e. if you install UHD in /opt/uhd you should add /opt/uhd/lib to the
LD_LIBRARY_PATH but not the source location. The same for GNU Radio
libraries.

It looks like you have installed boost 1.37 from source. While that’s
okay, it is only required for Ubuntu 8.04 or older and you may get
into trouble if you have also installed a binary package from Ubuntu
repository.

It seems many newcomers become confused with the Ubuntu installation
instructions. I think it is because it covers many versions going all
the way back to 6.10 so a lot of information is irrelevant for those
who use a recent version of Ubuntu. I’ll try to find some time to fix
that by splitting the page in two.

Alex

I first tried make distclean and the installation went fine, but when I
tried to start the GRC, following window showed up:
http://tinypic.com/r/dq671d/7 containing the error message “Cannot
import
gnuradio. Are your PHYTONPATH and LD_LIBRARY_PATH set correctly?”

This is a package config check, where is uhd.pc? Is it in your
PKG_CONFIG_PATH?

http://code.ettus.com/redmine/ettus/projects/uhd/wiki#Gnuradio-UHD

-Josh

how about a good luck sudo ldconfig? -josh

Dear Alexandru, dear list,

i made the recommended changes (see comments in Alexandrus last message)
but
still got the same error at configure:
checking for UHD… no
gr-uhd requires libuhd 2.x.x
configure: error: Component gr-uhd has errors; stopping.

when I try to configure without --enable-gr-uhd it finishes without an
error
but doesn’t show the gr-uhd component. Neither at the successfully
configured nor the skipped components.

Any more hints at what to change, where to look or what to try will be
appreciated.
For now I’m of till Monday. Everyone have a nice weekend!

Fabian

On Fri, Jan 21, 2011 at 2:54 PM, Alexandru C. [email protected]
wrote:

Hi Fabian,

Did you set the PYTHONPATH?
It should be set to PREFIX/lib/python2.6/site-packages where PREFIX is
whatever you have specified during “./configure --prefix=…”
(/usr/local if you haven’t specified anything). Check the directory,
there should be a subdirectory called gnuradio and one called
grc_gnuradio.

I checked the path and there are the subdirectories gnuradio, grc_gnuradio
and usrpm. But I’ll still did
PYHTHONPATH=usr/local/lib/python2.6/dist-packages/ to be sure.

A few other notes:

It seems you have two UHD installations:

./usr/local/lib/libuhd.so
./opt/uhd/lib/libuhd.so
You should uninstall one of them (btw. is there really a ‘.’ in the
path’s above?)

The ‘.’ is really there, i searched from the highest directory ( cd / ).
The first one should be from an older install that i uninstalled before
the
new install where i then specified a different DCMAKE_INSTALL_PREFIX, so
i
hope just deleting the library should be sufficient to “uninstall” it

You should not specify multiple locations for the installed libraries,
i.e. if you install UHD in /opt/uhd you should add /opt/uhd/lib to the
LD_LIBRARY_PATH but not the source location. The same for GNU Radio
libraries.

Fixed it to LD_LIBRARY_PATH=/opt/uhd/lib/:/opt/boost_1_37_0/lib
I hope that this is ok.

It looks like you have installed boost 1.37 from source. While that’s
okay, it is only required for Ubuntu 8.04 or older and you may get
into trouble if you have also installed a binary package from Ubuntu
repository.

As far as i can tell, there should be no other boost package there
unless
they get an auto-update (btw., I’m using Ubuntu 10.04)

It seems many newcomers become confused with the Ubuntu installation
instructions. I think it is because it covers many versions going all
the way back to 6.10 so a lot of information is irrelevant for those
who use a recent version of Ubuntu. I’ll try to find some time to fix
that by splitting the page in two.

I think that would help a lot in getting started!

The configure check is very simple. Just make sure that uhd.pc is in
your PKG_CONFIG_PATH, and that if you look at uhd.pc, the version should
read 002.. If not, then you didnt update or install the
latest uhd, that could be another reason its getting rejected.

-Josh

I tried sudo ldconfig several times, no luck there :frowning:

I think I also checked PKG_CONFIG_PATH and uhd.pc was in the (standard?)
/usr/local/lib/pkgconfig, but right now I’m not sure about this. I will
check this on monday again!
Nevertheless I also did (see also my 3rd message in this thread):
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:${PKG_CONFIG_PATH}
so i think i should be fine (but will be checked monday)

If this doesn’t work out, i think the best move would be to do a fresh
install of Ubuntu and try to install UHD and GNUradio again on a
complete
clean system?

Good Night

Fabian

Dear list,

i did a fresh try from a clean, new installed Ubuntu 10.04 and with the
reworked installation instruction on [1], and now it works
(unfortunately, i
still don’t know what has been the issue before).

For the record, here is, what i did (see also the instructions on [1],
[2]
and [3]):

#Install the dependecies for GNU Radio on Ubuntu 10.04:

sudo apt-get -y install libfontconfig1-dev libxrender-dev libpulse-dev
swig g++ automake autoconf libtool python-dev libfftw3-dev
libcppunit-dev libboost-all-dev libusb-dev fort77 sdcc sdcc-libraries
libsdl1.2-dev python-wxgtk2.8 subversion git-core guile-1.8-dev
libqt4-dev python-numpy ccache python-opengl libgsl0-dev
python-cheetah python-lxml doxygen qt4-dev-tools
libqwt5-qt4-dev libqwtplot3d-qt4-dev pyqt4-dev-tools

#Install git and cmake:

sudo apt-get install git-core cmake

#Download and install UHD from git:

git clone git://code.ettus.com/ettus/uhd.git
cd uhd/host
mkdir build
cd build
cmake …/
make
make test
sudo make install
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib #Check where
your path is with “find |grep libuhd”

#To test if the installation was succesfull run “uhd_find_devices”

#Download and install GNU Radio from git:

git clone gnuradio.git - GNU Radio
cd gnuradio
git branch --track next origin/next
git checkout next
git branch #Just to check if you really got the right branch
export PKG_CONFIG_PATH=/usr/local/lib/pgkconfig:${PKG_CONFIG_PATH}
./bootstrap
./configure #I did it with --enable-gr-uhd because of the trouble i had
before
make
make check
sudo make install

#Done! Now i could run gnuradio-companion and found the UHD Blocks

[1] http://gnuradio.org/redmine/wiki/gnuradio/UbuntuInstall
[2] http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki
[3] http://www.ettus.com/uhd_docs/manual/html/build.html

Fabian

On Sat, Jan 22, 2011 at 1:35 AM, Josh B. [email protected] wrote:

The configure check is very simple. Just make sure that uhd.pc is in
your PKG_CONFIG_PATH, and that if you look at uhd.pc, the version should
read 002.. If not, then you didnt update or install the
latest uhd, that could be another reason its getting rejected.

-Josh

Version of uhd.pc read 002.20110121005246.c14bbff, but i still did the
fresh
install.

I am having the same problem. When the configure breaks on UHD it says I
need libuhd.1.x.x. I have libuhd.0.0.2 in /usr/local/lib and uhd.pc is
in pkgconfig directory. I have PKG_CONFIG_PATH=/usr/local/lib/pkgconfig.
I have also done sudo ldconfig. I really dont want to wipe my whole
system. Oh, UHD works correctly, uhd_find_devices and rx_samples_to_file
both work.

Any other ideas?

Scott

Josh B. wrote:

On 01/21/2011 05:02 AM, Fabian K. wrote:

I then tried git clean -dfx and rebuilding from scratch (for UHD and
PATH=$PATH:/opt/uhd/bin
git checkout next

gr-uhd requires libuhd 2.x.x

[1] http://gnuradio.org/redmine/wiki/1/UbuntuInstall

make[6]: *** Keine Regel vorhanden, um das Target usrp_prims.cc,

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MIT Lincoln Laboratory
244 Wood Street, Lexington, MA 02420-9108
(781) 981-8196
[email protected]

Cat your /usr/local/lib/pkgconfig/uhd.pc files and
gnuradio/config/grc_gr_uhd.m4 and make sure the version reqs match up.
Or the repo is out of date. -josh

On Mon, Jan 24, 2011 at 4:40 PM, Fabian K. [email protected]
wrote:

Dear list,

i did a fresh try from a clean, new installed Ubuntu 10.04 and with the
reworked installation instruction on [1], and now it works (unfortunately, i
still don’t know what has been the issue before).

Thanks for the update.
I suspect the problem was multiple versions of one or more libraries
installed. They can be difficult to get rid of.

Alex

Thanks Josh. Getting the newest gnuradio from git solved the uhd
problem, but now gnuradio is broken. I know it must be some path problem
but I have tried the usual tricks: I set my
PYTHONPATH=/usr/local/lib/pkgconfig/dist-packages and
LD_LIBRARY_PATH=/usr/local/lib and I did sudo ldconfig in the gnuradio
directory. And I checked /etc/ld.so.conf and /usr/local/lib is in there.

I get the following problem when trying to run any gnuradio programs.
And when I try gnuradio-companion a gui pops up that says "can’t import
gnuradio, are your PYTHONPATH and LD_LIBRARY_PATH set correctly?

sjohnston@ubunte:~/gnuradio/
gnuradio-examples/python/pfb$ ./channelize.py --help
Traceback (most recent call last):
File “./channelize.py”, line 23, in
from gnuradio import gr, blks2
File “/usr/local/lib/python2.6/dist-packages/gnuradio/gr/init.py”,
line 43, in
from gnuradio_core import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py”,
line 23, in
from gnuradio_core_runtime import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 24, in
_gnuradio_core_runtime = swig_import_helper()
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 20, in swig_import_helper
_mod = imp.load_module(‘_gnuradio_core_runtime’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-core-3.4git.so.0: undefined
symbol: _ZTIN5gruel12msg_accepterE

sjohnston@ubunte:~/gnuradio/gnuradio-examples/python/digital$
./benchmark_loopback.py --help
Traceback (most recent call last):
File “./benchmark_loopback.py”, line 23, in
from gnuradio import gr, gru, modulation_utils
File “/usr/local/lib/python2.6/dist-packages/gnuradio/gr/init.py”,
line 43, in
from gnuradio_core import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py”,
line 23, in
from gnuradio_core_runtime import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 24, in
_gnuradio_core_runtime = swig_import_helper()
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 20, in swig_import_helper
_mod = imp.load_module(‘_gnuradio_core_runtime’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-core-3.4git.so.0: undefined
symbol: _ZTIN5gruel12msg_accepterE

Josh B. wrote:

system. Oh, UHD works correctly, uhd_find_devices and rx_samples_to_file

read 002.. If not, then you didnt update or install the

/usr/local/lib/pkgconfig, but right now I’m not sure about this. I will
Good Night

On 01/21/2011 05:02 AM, Fabian K. wrote:

cmake -DCMAKE_INSTALL_PREFIX=/opt/uhd …/

didn’t help
./home/fs/gnuradio-git/uhd/host/build/lib/libuhd.so.002

make[6]: *** No Rule given, for making Target usrp_prims.cc,
really glad.
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(781) 981-8196
[email protected]

On Wed, Feb 16, 2011 at 3:19 PM, Scott Johnston
[email protected] wrote:

Thanks Josh. Getting the newest gnuradio from git solved the uhd problem,
but now gnuradio is broken. I know it must be some path problem but I have
tried the usual tricks: I set my
PYTHONPATH=/usr/local/lib/pkgconfig/dist-packages and
LD_LIBRARY_PATH=/usr/local/lib and I did sudo ldconfig in the gnuradio
directory. And I checked /etc/ld.so.conf and /usr/local/lib is in there.

Maybe just a typo, but instead of
PYTHONPATH=/usr/local/lib/pkgconfig/dist-packages

try:
PYTHONPATH=/usr/local/lib/python2.6/site-packages

Alex

Yes, that was typo.

PYTHONPATH=/usr/local/lib/python2.6/dist-packages

I did mean dist-pakages. I have three directories in dist, gnuradio
grc_gnuradio usrpm. And nothing in the site-packages.

Alexandru C. wrote:

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Scott Johnston
MIT Lincoln Laboratory
244 Wood Street, Lexington, MA 02420-9108
(781) 981-8196
[email protected]

Hi Scott,

I think this is OK because the two version strings are not
automatically linked. I have the same version(s) as you do.
The git version string is generated with respect to the latest git
tag, which is “v3.3.1git”; however, it was apparently decided that the
next release will be v3.4, the version string was updated but no new
tag was made in git so the git tag is still v3.3.1.

From the error message you posted in your previous mail, I really
can’t think of anything else than there is an old version of gnuradio
installed and it takes precedence over the new version - maybe because
it is installed in /usr/lib ?

Alex

On Fri, Feb 18, 2011 at 5:33 PM, Scott Johnston

Yes you are right, there is an older version installed in /usr/lib. Do
you know how to get rid of it? Please say yes without having to
reinstall the OS :slight_smile:

Thanks

Scott

Alexandru C. wrote:

can’t think of anything else than there is an old version of gnuradio

I think I am having a version problem. I followed the instructions from the
./configure
it says the version is 3.3.1. As far as I know version 3.4 doesn’t exist
MAJOR_VERSION=3
includedir=${prefix}/include/gnuradio
sjohnston@ubunte:~/gnuradio$ ./configure

File “/usr/local/lib/python2.6/dist-packages/gnuradio/gr/init.py”,
File
File “./benchmark_loopback.py”, line 23, in
line 24, in

problem,

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(781) 981-8196
[email protected]

All,

I think I am having a version problem. I followed the instructions from
the gnuradio and UHD Start page.
I download gnuradio using

$ git clone git://gnuradio.org/gnuradio
git branch --track next origin/next
git checkout next

And then I do the usual

./bootstrap
./configure
make
make check
sudo make install
sudo ldconfig

Everything goes fine and everything that I expect to get installed does,
but then as soon as I try to run something it breaks, see errors below.
I dug further, and I think I have a version problem. Both the version.sh
file in my gnuradio directory and the gnuradio-core.pc file in
/usr/local/lib/pkgconfig say the version in 3.4. But when I run
./configure it says the version is 3.3.1. As far as I know version 3.4
doesn’t exist yet. I have uninstalled and deleted everything and
reinstalled and the problem remains the same.

Anybody what the problem is?

TIA

Scott

sjohnston@ubunte:~/gnuradio$ cat version.sh
MAJOR_VERSION=3
API_COMPAT=4
MINOR_VERSION=git
MAINT_VERSION=

sjohnston@ubunte:/usr/local/
lib/pkgconfig$ cat gnuradio-core.pc
prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include/gnuradio
guile_load_path=/usr/local/share/guile/site

Name: gnuradio-core
Description: GNU Software Radio toolkit
Requires: gruel fftw3f gsl
Version: 3.4git
Libs.private: -L/usr/lib -lboost_thread-mt -lboost_date_time-mt
Libs: -L${libdir} -lgnuradio-core
Cflags: -I/usr/include -pthread -I${includedir}

sjohnston@ubunte:~/gnuradio$ ./configure
checking build system type… x86_64-unknown-linux-gnu
checking host system type… x86_64-unknown-linux-gnu
checking target system type… x86_64-unknown-linux-gnu
checking for git… /usr/bin/git
checking existence of git version control directory… ok
checking git description of current commit… v3.3.1git-956-g501aa52b
configure: GNU Radio Release v3.3.1git-956-g501aa52b

I get the following problem when trying to run any gnuradio programs.
And when I try gnuradio-companion a gui pops up that says "can’t import
gnuradio, are your PYTHONPATH and LD_LIBRARY_PATH set correctly?

sjohnston@ubunte:~/gnuradio/
gnuradio-examples/python/pfb$ ./channelize.py --help
Traceback (most recent call last):
File “./channelize.py”, line 23, in
from gnuradio import gr, blks2
File “/usr/local/lib/python2.6/dist-packages/gnuradio/gr/init.py”,
line 43, in
from gnuradio_core import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py”,
line 23, in
from gnuradio_core_runtime import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 24, in
_gnuradio_core_runtime = swig_import_helper()
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 20, in swig_import_helper
_mod = imp.load_module(‘_gnuradio_core_runtime’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-core-3.4git.so.0: undefined
symbol: _ZTIN5gruel12msg_accepterE

sjohnston@ubunte:~/gnuradio/gnuradio-examples/python/digital$
./benchmark_loopback.py --help
Traceback (most recent call last):
File “./benchmark_loopback.py”, line 23, in
from gnuradio import gr, gru, modulation_utils
File “/usr/local/lib/python2.6/dist-packages/gnuradio/gr/init.py”,
line 43, in
from gnuradio_core import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py”,
line 23, in
from gnuradio_core_runtime import *
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 24, in
_gnuradio_core_runtime = swig_import_helper()
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py”,
line 20, in swig_import_helper
_mod = imp.load_module(‘_gnuradio_core_runtime’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-core-3.4git.so.0: undefined
symbol: _ZTIN5gruel12msg_accepterE

Scott Johnston wrote:

Alexandru C. wrote:

directory. And I checked /etc/ld.so.conf and /usr/local/lib is in there.


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Scott Johnston
MIT Lincoln Laboratory
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(781) 981-8196
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