Great, I'll try what you suggest.
Regards
Carl
> On 12 Oct 2019, at 19:02, Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
> wrote:
>
> Em Sat, 12 Oct 2019 18:28:41 +0100
> _ _ _ _ _ <clang...@toucansurf.com> escreveu:
>
>> I've been waiting for a working version of DVB-S2 capable tools and
>> utilities to appear in a stable release of Mint, but it hasn't happened
>> yet, so I decided to build the latest stable v4l-utils from source.
>>
>> I built v4l-utils version 1.18.0 on Linux Mint 18.3
>>
>> the compilation process appeared to run through OK with only 9 warnings (see
>> below), but the resulting executables fail due to a lib ref issue.
>> configure: WARNING: doxygen not found - will not generate any doxygen
>> documentation
>> configure: WARNING: libelf library not available
>> configure: WARNING: Qt5 or higher is not available
>> configure: WARNING: ALSA library not available
>> CC control/libv4lconvert_la-libv4lcontrol.lo
>> control/libv4lcontrol.c: In function ‘v4lcontrol_create’:
>> control/libv4lcontrol.c:728:3: warning: ignoring return value of
>> ‘ftruncate’, declared with attribute warn_unused_result [-Wunused-result]
>> ftruncate(shm_fd, V4LCONTROL_SHM_SIZE);
>> ^
>> libtool: warning: relinking 'libv4l2.la'
>> libtool: warning: relinking 'v4l2convert.la'
>> libtool: warning: relinking 'libv4l1.la'
>> libtool: warning: relinking 'v4l1compat.la'
>>
>> Most of these look insignificant but the fifth one looks a bit worrying.
>
> Shouldn't have any real consequence. it is just because there's nothing
> like:
>
> ret = ftruncate(...)
> if (ret) {
> /* some error handling logic */
> }
>
>>
>> End result :-
>>
>> stupiduser@somehost ~ $ gcc --version
>> gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 2016060
>>
>> stupiduser@somehost ~ $ dvbv5-scan -V
>> dvbv5-scan version 1.18.0
>>
>> stupiduser@somehost ~ $ dvbv5-scan /usr/share/dvb/dvb-s/Astra-28.2E
>> dvbv5-scan: symbol lookup error: dvbv5-scan: undefined symbol: dvb_dev_alloc
>>
>> stupiduser@somehost ~ $ dvb-fe-tool -m -a0
>> dvb-fe-tool: symbol lookup error: dvb-fe-tool: undefined symbol:
>> dvb_dev_alloc
>
> Probably you have an older version of DVB libraries installed on
> your machine. It is trying to use the older library when you try
> to run it.
>
> There are some ways of solving it:
>
> 1) Make configure to override the old library with:
>
> ./configure --prefix=/usr
>
> (the default is to install it at /usr/local)
>
> 2) Ensure that the dynamic linker will use the libraries from
> /usr/local
>
> Depending on how your distro is set, you could need to add a
> new file at /etc/ld.so.conf.d/, in order to teach the dynamic
> linker to use the /usr/local/lib directory to seek for libraries.
>
> For example, create a "/etc/ld.so.conf.d/local.conf" file, and make the
> system use it by running, as root:
>
> # echo "/usr/local/lib" > /etc/ld.so.conf.d/local.conf
> # ldconfig
>
> PS.: You may need to remove a previous install of the V4L and DVB
> libs, in order to avoid any conflicts.
>
> 3) use the environment var LD_LIBRARY_PATH in order to add
> /usr/local/lib to the list of directories it will seek for a
> library.
>
> Thanks,
> Mauro
