[R-sig-Geo] cannot install rgdal after updating to fedora32

Roger Bivand Roger@B|v@nd @end|ng |rom nhh@no
Mon Jun 29 16:32:29 CEST 2020


On Mon, 29 Jun 2020, Bennet Fauber wrote:

> Thanks for the update, Roger!  Very glad you got a response so
> quickly, and a fix to match.

I hope it worked in your case.

>
> I would reiterate Iñaki's warning to folks.
>
>    ...note that CPPFLAGS are *not* CXXFLAGS; I say this because it's
> a common mistake
>
> CPPFLAGS -> C preprocessor and are use to specify include files
> CXXFLAGS -> C++ compilation flags
>
> I have hurt myself several times thinking that CPP must be C Plus
> Plus, not C Pre Processor.

Not the case here, CPP was for the pre-processor and had been around a 
long time to try to union the positions of R, GDAL and PROJ if possible.

Roger

>
> On Mon, Jun 29, 2020 at 8:03 AM Roger Bivand <Roger.Bivand using nhh.no> wrote:
>>
>> In thread
>> https://stat.ethz.ch/pipermail/r-sig-fedora/2020-June/000653.html, Iñaki
>> Úcar explains that, following the introduction of AC_LANG(C++) into
>> configure.ac about 11 June, the Fedora R rpm would also need CXXFLAGS set.
>>
>> Having added : ${CXXFLAGS=`"${RBIN}" CMD config CXXFLAGS`} to
>> configure.ac, I can confirm that the work-around flag is not needed, and
>> that (once R-forge revision 1021 completes), install.packages("rgdal",
>> repos="http://R-Forge.R-project.org") should work on Fedora R rpm
>> platforms. Those affected please check and confirm.
>>
>> Many thanks to Bennet and Iñaki!
>>
>> Roger
>>
>> On Mon, 29 Jun 2020, Roger Bivand wrote:
>>
>>> Bennet,
>>>
>>> Thanks for the careful analysis.
>>>
>>> On Sun, 28 Jun 2020, Bennet Fauber wrote:
>>>
>>>>  Roger,
>>>>
>>>>  This seems to be an outcome of a 'security' policy that
>>>>  RedHat/Fedora/CentOS implemented.  There are some circumstances where
>>>>  I think that could be justified, but I do not think compiling R is one
>>>>  of them.
>>>>
>>>>  It was reported several times to RedHat's Bugzilla and basically
>>>>  ignored by RedHat at least as far back as 2015-12-02.  There are
>>>>  several reports of slightly different versions of the report, but none
>>>>  of them got acted upon.  Some details and links to other issues marked
>>>>  as duplicates (but also seemingly closed without any attention or
>>>>  action) can be found at
>>>>
>>>>     https://bugzilla.redhat.com/show_bug.cgi?id=1287743
>>>>
>>>
>>> https://bugzilla.redhat.com/show_bug.cgi?id=1343892 includes more
>>> information. Many traces in search suggest that a missing redhat-rpm-config
>>> package is to blame, but it is certainly present on my test system.
>>>
>>> The Redhat policy positions are specified in:
>>>
>>> https://developers.redhat.com/blog/2018/03/21/compiler-and-linker-flags-gcc/
>>>
>>> but do not seem to resolve the conflict between autoconf and
>>> -specs=/usr/lib/rpm/redhat/redhat-hardened-ld.
>>>
>>> I'll raise this on the R fedora list.
>>>
>>> Roger
>>>
>>>>  The version of R-rgdal that is in the Fedora archive as a binary is
>>>>  rgdal_1.4-8 and that .srpm will build, however if it is updated to use
>>>>  rgdal_1.5-12 it fails the same way that it does with the source build.
>>>>
>>>>
>>>>
>>>>  On Sun, Jun 28, 2020 at 1:17 PM Roger Bivand <Roger.Bivand using nhh.no> wrote:
>>>>>
>>>>>  On Sun, 28 Jun 2020, Ista Zahn wrote:
>>>>>
>>>>>>  I can reproduce this error using the official Fedora 32 docker image:
>>>>>
>>>>>  The error is in the RPM propagating its LDFLAGS which are  not needed (or
>>>>>  cause no havoc) in simple tests for C compiler functionality in
>>>>>  ./configure. For the arguably broken R rpm, use either LDFLAGS="" or the
>>>>>  svn rev. 1020 configure argument --disable-loadflags. The load flags are
>>>>>  far more than is sensibly needed to check whether the compile train
>>>>>  works.
>>>>>  I have used RH, RHEL and Fedora since the last century, and have always
>>>>>  installed R from source. Recently, the TexLive packaging system drew in
>>>>>  (totally unecessarily) a dependency on the R rpm, which I now have to
>>>>>  avoid using. My rpm:
>>>>>
>>>>>  $ /usr/bin/R CMD config LDFLAGS
>>>>>  -Wl,-z,relro -Wl,--as-needed -Wl,-z,now
>>>>>  -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
>>>>>
>>>>>  and compiled from source:
>>>>>
>>>>>  $ R CMD config LDFLAGS
>>>>>  -L/usr/local/lib64
>>>>>
>>>>>  Why the rpm LDFLAGS demolish a simple AC_LANG(C++) (guesswork, now line
>>>>>  504 in configure.ac) is unknown for me, hence the need for the
>>>>>  workaround.
>>>>>
>>>>>  I advise strongly against binary packaging of rgdal for Linux, and was
>>>>>  not
>>>>>  aware that any such packaging had been attempted. Changes in GDAL and
>>>>>  PROJ
>>>>>  happen fast, and Fedora/Centos etc. have been really slow to update.
>>>>>
>>>>>  If anyone understands why the R Fedora rpm imposes such vicious LDFLAGS
>>>>>  and can explain why they are needed and how to run a cross platform
>>>>>  configure script without having to special-case platforms, I'd be mildly
>>>>>  interested to know. sf has also been through similar trouble as mentioned
>>>>>  earlier in this thread.
>>>>>
>>>>>  Roger
>>>>>
>>>>>>
>>>>>>  docker run -it library/fedora:32
>>>>>>  dnf install 'dnf-command(builddep)'
>>>>>>  dnf builddep R-rgdal
>>>>>>  R
>>>>>>  install.packages("rgdal")
>>>>>>
>>>>>>  * installing *source* package ‘rgdal’ ...
>>>>>>  ** package ‘rgdal’ successfully unpacked and MD5 sums checked
>>>>>>  ** using staged installation
>>>>>> configure:  R_HOME: /usr/lib64/R
>>>>>> configure:  CC: gcc -m64
>>>>>> configure:  CXX: g++ -m64 -std=gnu++11
>>>>>> configure:  CXX11 is: g++ -m64, CXX11STD is: -std=gnu++11
>>>>>> configure:  CXX is: g++ -m64 -std=gnu++11
>>>>>> configure:  C++11 support available
>>>>>> configure:  rgdal: 1.5-12
>>>>>>  checking for /usr/bin/svnversion... no
>>>>>> configure:  svn revision: 1018
>>>>>>  checking for gdal-config... /usr/bin/gdal-config
>>>>>>  checking gdal-config usability... yes
>>>>>> configure:  GDAL: 3.0.4
>>>>>>  checking GDAL version >= 1.11.4... yes
>>>>>>  checking GDAL version <= 2.5 or >= 3.0... yes
>>>>>>  checking GDAL: linking with --libs only... yes
>>>>>>  checking GDAL: gdal-config data directory readable... yes
>>>>>>  checking GDAL: /usr/share/gdal/stateplane.csv readable... yes
>>>>>> configure:  pkg-config proj exists, will use it
>>>>>> configure:  PROJ version: 6.3.2
>>>>>> configure:  PROJ CPP flags: -DPROJ_H_API
>>>>>> configure:  PROJ LIBS: -lproj
>>>>>>  checking PROJ header API:... yes
>>>>>>  checking whether the C++ compiler works... yes
>>>>>>  checking for C++ compiler default output file name... a.out
>>>>>>  checking for suffix of executables...
>>>>>>  checking whether we are cross compiling... configure: error: in
>>>>>>  `/tmp/Rtmp2o3TMz/R.INSTALLf5d2a7cbb3e/rgdal':
>>>>>> configure:  error: cannot run C++ compiled programs.
>>>>>>  If you meant to cross compile, use `--host'.
>>>>>>  See `config.log' for more details
>>>>>>  ERROR: configuration failed for package ‘rgdal’
>>>>>>  * removing ‘/usr/lib64/R/library/rgdal’
>>>>>>
>>>>>>  The downloaded source packages are in
>>>>>>         ‘/tmp/RtmpooFgiH/downloaded_packages’
>>>>>>  Updating HTML index of packages in '.Library'
>>>>>>  Warning messages:
>>>>>>  1: In install.packages("rgdal") :
>>>>>>  installation of package ‘rgdal’ had non-zero exit status
>>>>>>  2: In file.create(f.tg) :
>>>>>>  cannot create file '/usr/share/doc/R/html/packages.html', reason 'No
>>>>>>  such file or directory'
>>>>>>  3: In make.packages.html(.Library) : cannot update HTML package index
>>>>>>>
>>>>>>
>>>>>>  I don't have any insight into what happens here, but it is reproducible.
>>>>>>
>>>>>>  Best,
>>>>>>  Ista
>>>>>>
>>>>>>  On Sun, Jun 28, 2020 at 9:42 AM Veronica Andreo <veroandreo using gmail.com>
>>>>>>  wrote:
>>>>>>>
>>>>>>>  Dear Roger,
>>>>>>>
>>>>>>>  Thanks for the answer.
>>>>>>>
>>>>>>>  R is installed from Fedora repos and no, I do not have any issues with
>>>>>>>  sf. It installs and loads just fine.
>>>>>>>
>>>>>>>  I downloaded the new rgdal tar.gz from R-forge, but I get the same
>>>>>>>  error that was reported yesterday; config.log file attached. The first
>>>>>>>  error I see there is in line 98-99 about a -V not recognized and then
>>>>>>>  another one for -qversion. Are those relevant?
>>>>>>>
>>>>>>>  Vero
>>>>>>>  ---
>>>>>>>  install.packages("~/Downloads/rgdal_1.5-13.tar.gz", repos = NULL, type
>>>>>>>  = "source")
>>>>>>>  Installing package into
>>>>>>>  ‘/home/veroandreo/R/x86_64-redhat-linux-gnu-library/3.6’
>>>>>>>  (as ‘lib’ is unspecified)
>>>>>>>  * installing *source* package ‘rgdal’ ...
>>>>>>>  ** using staged installation
>>>>>>> configure:  R_HOME: /usr/lib64/R
>>>>>>> configure:  CC: gcc -m64
>>>>>>> configure:  CXX: g++ -m64 -std=gnu++11
>>>>>>> configure:  CFLAGS: -O2 -g -pipe -Wall -Werror=format-security
>>>>>>> configure:  -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
>>>>>>> configure:  -fexceptions -fstack-protector-strong -grecord-gcc-switches
>>>>>>> configure:  -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
>>>>>>> configure:  -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64
>>>>>>> configure:  -mtune=generic -fasynchronous-unwind-tables
>>>>>>> configure:  -fstack-clash-protection -fcf-protection
>>>>>>> configure:  CPPFLAGS: -I/usr/local/include
>>>>>>> configure:  LDFLAGS: -Wl,-z,relro -Wl,--as-needed -Wl,-z,now
>>>>>>> configure:  -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
>>>>>>>  loadflags: yes
>>>>>>> configure:  LDFLAGS: -Wl,-z,relro -Wl,--as-needed -Wl,-z,now
>>>>>>> configure:  -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
>>>>>>> configure:  CXX11 is: g++ -m64, CXX11STD is: -std=gnu++11
>>>>>>> configure:  CXX is: g++ -m64 -std=gnu++11
>>>>>>> configure:  C++11 support available
>>>>>>> configure:  rgdal: 1.5-13
>>>>>>>  checking for /usr/bin/svnversion... yes
>>>>>>>  cat: inst/SVN_VERSION: No such file or directory
>>>>>>> configure:  svn revision:
>>>>>>>  checking for gdal-config... /usr/bin/gdal-config
>>>>>>>  checking gdal-config usability... yes
>>>>>>> configure:  GDAL: 3.0.4
>>>>>>>  checking GDAL version >= 1.11.4... yes
>>>>>>>  checking GDAL version <= 2.5 or >= 3.0... yes
>>>>>>>  checking GDAL: linking with --libs only... yes
>>>>>>>  checking GDAL: gdal-config data directory readable... yes
>>>>>>>  checking GDAL: /usr/share/gdal/stateplane.csv readable... yes
>>>>>>> configure:  pkg-config proj exists, will use it
>>>>>>> configure:  PROJ version: 6.3.2
>>>>>>> configure:  PROJ CPP flags: -DPROJ_H_API
>>>>>>> configure:  PROJ LIBS: -lproj
>>>>>>>  checking PROJ header API:... yes
>>>>>>>  checking whether the C++ compiler works... yes
>>>>>>>  checking for C++ compiler default output file name... a.out
>>>>>>>  checking for suffix of executables...
>>>>>>>  checking whether we are cross compiling... configure: error: in
>>>>>>>  `/home/veroandreo/tmp/Rtmp9DsGuk/R.INSTALL16352f5a74a/rgdal':
>>>>>>> configure:  error: cannot run C++ compiled programs.
>>>>>>>  If you meant to cross compile, use `--host'.
>>>>>>>  See `config.log' for more details
>>>>>>>  ERROR: configuration failed for package ‘rgdal’
>>>>>>>  * removing
>>>>>>>  ‘/home/veroandreo/R/x86_64-redhat-linux-gnu-library/3.6/rgdal’
>>>>>>>  Warning in install.packages :
>>>>>>>    installation of package
>>>>>>>    ‘/home/veroandreo/Downloads/rgdal_1.5-13.tar.gz’ had non-zero exit
>>>>>>>    status
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>  El dom., 28 jun. 2020 a las 14:44, Roger Bivand (<Roger.Bivand using nhh.no>)
>>>>>>>  escribió:
>>>>>>>>
>>>>>>>>  On Sun, 28 Jun 2020, Roger Bivand wrote:
>>>>>>>>
>>>>>>>>>  Vero,
>>>>>>>>>
>>>>>>>>>  On Sat, 27 Jun 2020, Veronica Andreo wrote:
>>>>>>>>>
>>>>>>>>>>   See the attached config.log file
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>  How did you install R itself? If an rpm, then
>>>>>>>>>
>>>>>>>>>  https://github.com/r-spatial/sf/issues/1369
>>>>>>>>>
>>>>>>>>>  may be relevant, also if you see errors installing sf. You would need
>>>>>>>>>  to
>>>>>>>>>  unset LDFLAGS before installing:
>>>>>>>>>
>>>>>>>>>  https://github.com/r-spatial/sf/issues/1369#issuecomment-614096865
>>>>>>>>>
>>>>>>>>>  Please report back on this.
>>>>>>>>
>>>>>>>>  LDFLAGS needs unsetting. Revision 1020 on R-Forge
>>>>>>>>
>>>>>>>>  https://r-forge.r-project.org/R/?group_id=884
>>>>>>>>
>>>>>>>>  includes a new configure argument --disable-loadflags to assist in
>>>>>>>>  unsetting the very specific R rpm LDFLAGS. Please report if this fixes
>>>>>>>>  the
>>>>>>>>  problem.
>>>>>>>>
>>>>>>>>  Roger
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>>  Roger
>>>>>>>>>
>>>>>>>>>>   El sáb., 27 jun. 2020 a las 21:29, Veronica Andreo
>>>>>>>>>>   (<veroandreo using gmail.com>)
>>>>>>>>>>   escribió:
>>>>>>>>>>
>>>>>>>>>>>   Hello everyone
>>>>>>>>>>>
>>>>>>>>>>>   I have just updated my system to fedora 32 (which fetched GDAL 3
>>>>>>>>>>>   and PROJ
>>>>>>>>>>>   6) and when updating my R packages, I get the following error for
>>>>>>>>>>>   rgdal.
>>>>>>>>>>>   Can someone help me out here? What does it mean that it cannot run
>>>>>>>>>>>   C++
>>>>>>>>>>>   compiled programs?  And do I want to crosscompile?
>>>>>>>>>>>
>>>>>>>>>>>   Thanks much in advance
>>>>>>>>>>>
>>>>>>>>>>>   Vero
>>>>>>>>>>>
>>>>>>>>>>>   ---
>>>>>>>>>>>
>>>>>>>>>>>   install.packages("rgdal")
>>>>>>>>>>>   Installing package into
>>>>>>>>>>>   ‘/home/veroandreo/R/x86_64-redhat-linux-gnu-library/3.6’
>>>>>>>>>>>   (as ‘lib’ is unspecified)
>>>>>>>>>>>   trying URL
>>>>>>>>>>>   'http://cran.rstudio.com/src/contrib/rgdal_1.5-12.tar.gz'
>>>>>>>>>>>   Content type 'application/x-gzip' length 2302403 bytes (2.2 MB)
>>>>>>>>>>>   ==================================================
>>>>>>>>>>>   downloaded 2.2 MB
>>>>>>>>>>>
>>>>>>>>>>>   * installing *source* package ‘rgdal’ ...
>>>>>>>>>>>   ** package ‘rgdal’ successfully unpacked and MD5 sums checked
>>>>>>>>>>>   ** using staged installation
>>>>>>>>>>> configure:   R_HOME: /usr/lib64/R
>>>>>>>>>>> configure:   CC: gcc -m64
>>>>>>>>>>> configure:   CXX: g++ -m64 -std=gnu++11
>>>>>>>>>>> configure:   CXX11 is: g++ -m64, CXX11STD is: -std=gnu++11
>>>>>>>>>>> configure:   CXX is: g++ -m64 -std=gnu++11
>>>>>>>>>>> configure:   C++11 support available
>>>>>>>>>>> configure:   rgdal: 1.5-12
>>>>>>>>>>>   checking for /usr/bin/svnversion... yes
>>>>>>>>>>> configure:   svn revision: 1018
>>>>>>>>>>>   checking for gdal-config... /usr/bin/gdal-config
>>>>>>>>>>>   checking gdal-config usability... yes
>>>>>>>>>>> configure:   GDAL: 3.0.4
>>>>>>>>>>>   checking GDAL version >= 1.11.4... yes
>>>>>>>>>>>   checking GDAL version <= 2.5 or >= 3.0... yes
>>>>>>>>>>>   checking GDAL: linking with --libs only... yes
>>>>>>>>>>>   checking GDAL: gdal-config data directory readable... yes
>>>>>>>>>>>   checking GDAL: /usr/share/gdal/stateplane.csv readable... yes
>>>>>>>>>>> configure:   pkg-config proj exists, will use it
>>>>>>>>>>> configure:   PROJ version: 6.3.2
>>>>>>>>>>> configure:   PROJ CPP flags: -DPROJ_H_API
>>>>>>>>>>> configure:   PROJ LIBS: -lproj
>>>>>>>>>>>   checking PROJ header API:... yes
>>>>>>>>>>>   checking whether the C++ compiler works... yes
>>>>>>>>>>>   checking for C++ compiler default output file name... a.out
>>>>>>>>>>>   checking for suffix of executables...
>>>>>>>>>>>   checking whether we are cross compiling... configure: error: in
>>>>>>>>>>>   `/home/veroandreo/tmp/Rtmpo7AtPr/R.INSTALL12cc66f8f895/rgdal':
>>>>>>>>>>> configure:   error: cannot run C++ compiled programs. <<<<--- here
>>>>>>>>>>>   If you meant to cross compile, use `--host'.
>>>>>>>>>>>   See `config.log' for more details
>>>>>>>>>>>   ERROR: configuration failed for package ‘rgdal’
>>>>>>>>>>>   * removing
>>>>>>>>>>>   ‘/home/veroandreo/R/x86_64-redhat-linux-gnu-library/3.6/rgdal’
>>>>>>>>>>>   * restoring previous
>>>>>>>>>>>   ‘/home/veroandreo/R/x86_64-redhat-linux-gnu-library/3.6/rgdal’
>>>>>>>>>>>   Warning in install.packages :
>>>>>>>>>>>     installation of package ‘rgdal’ had non-zero exit status
>>>>>>>>>>>
>>>>>>>>>>>   ---
>>>>>>>>>>>
>>>>>>>>>>>   sessionInfo()
>>>>>>>>>>>   R version 3.6.3 (2020-02-29)
>>>>>>>>>>>   Platform: x86_64-redhat-linux-gnu (64-bit)
>>>>>>>>>>>   Running under: Fedora 32 (Thirty Two)
>>>>>>>>>>>
>>>>>>>>>>>   Matrix products: default
>>>>>>>>>>>   BLAS/LAPACK: /usr/lib64/libopenblas-r0.3.9.so
>>>>>>>>>>>
>>>>>>>>>>>   Random number generation:
>>>>>>>>>>>    RNG:     Mersenne-Twister
>>>>>>>>>>>    Normal:  Inversion
>>>>>>>>>>>    Sample:  Rounding
>>>>>>>>>>>
>>>>>>>>>>>   locale:
>>>>>>>>>>>    [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
>>>>>>>>>>>    [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
>>>>>>>>>>>    [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
>>>>>>>>>>>    [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>>>>>>>>>>>    [9] LC_ADDRESS=C               LC_TELEPHONE=C
>>>>>>>>>>>   [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>>>>>>>>>>>
>>>>>>>>>>>   attached base packages:
>>>>>>>>>>>   [1] stats     graphics  grDevices utils     datasets  methods
>>>>>>>>>>>   base
>>>>>>>>>>>
>>>>>>>>>>>   loaded via a namespace (and not attached):
>>>>>>>>>>>   [1] compiler_3.6.3 tools_3.6.3
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>  --
>>>>>>>>  Roger Bivand
>>>>>>>>  Department of Economics, Norwegian School of Economics,
>>>>>>>>  Helleveien 30, N-5045 Bergen, Norway.
>>>>>>>>  voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
>>>>>>>>  https://orcid.org/0000-0003-2392-6140
>>>>>>>>  https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en
>>>>>>>
>>>>>>>  _______________________________________________
>>>>>>>  R-sig-Geo mailing list
>>>>>>>  R-sig-Geo using r-project.org
>>>>>>>  https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>>>>>
>>>>>
>>>>>  --
>>>>>  Roger Bivand
>>>>>  Department of Economics, Norwegian School of Economics,
>>>>>  Helleveien 30, N-5045 Bergen, Norway.
>>>>>  voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
>>>>>  https://orcid.org/0000-0003-2392-6140
>>>>>  https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en_______________________________________________
>>>>>  R-sig-Geo mailing list
>>>>>  R-sig-Geo using r-project.org
>>>>>  https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>>>
>>>
>>>
>>
>> --
>> Roger Bivand
>> Department of Economics, Norwegian School of Economics,
>> Helleveien 30, N-5045 Bergen, Norway.
>> voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
>> https://orcid.org/0000-0003-2392-6140
>> https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en
>

-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
https://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en


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