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I am getting the following error while installing rgdal_1.5-15 in R (I am on a Ubuntu 18.04.4 LTS GNU/Linux 4.15.0-112-generic x86_64) :

projectit.cpp:159:6: error: conflicting declaration of C function ‘SEXPREC* transform_ng(SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP)’
SEXP transform_ng(SEXP fromargs, SEXP toargs, SEXP coordOp, SEXP npts, SEXP x, SEXP y, SEXP z SEXP aoi) {
  ^~~~~~~~~~~~
In file included from projectit.cpp:11:0:
rgdal.h:132:6: note: previous declaration ‘SEXPREC* transform_ng(SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP)’
SEXP transform_ng(SEXP fromargs, SEXP toargs, SEXP coordOp, SEXP npts, SEXP x, SEXP y, SEXP z, SEXP aoi); // both
  ^~~~~~~~~~~~
/usr/lib/R/etc/Makeconf:176: recipe for target 'projectit.o' failed
make: *** [projectit.o] Error 1
ERROR: compilation failed for package ‘rgdal’

I solved this issue by installing an older version (rgdal_1.4-8). This looks like a bug to me, but I could not find a repository to submit a bug report to (their github is read-only). Any help on finding one would be appreciated.

ze miguel
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  • Would rgdal2 be useful as a workaround? e.g. `if (packageVersion("devtools") < 1.6) { install.packages("devtools") } devtools::install_github("thk686/rgdal2")`? According to this [issue](https://github.com/OSGeo/gdal/issues/681#issuecomment-396957517) you should try `install.packages("rgdal", repos="http://R-Forge.R-project.org")` and/or you may be able to get some help from [@rsbivand](https://github.com/rsbivand) who appears to maintain the C++ bindings – jared_mamrot Aug 04 '20 at 10:51
  • me too. You can send e-mail to the maintainer (`maintainer("rgdal")`). There's an SVN repository at r-forge https://r-forge.r-project.org/projects/rgdal/ https://r-forge.r-project.org/scm/?group_id=884 , but no apparent mailing list. – Ben Bolker Aug 04 '20 at 18:57
  • If additional information would help answer this question, I encountered this issue on one of my Travis CI builds ( [log file](https://api.travis-ci.org/v3/job/714716987/log.txt) and [build file](https://github.com/jeffreyhanson/raptr/blob/master/.travis.yml) – paleo13 Aug 04 '20 at 21:58
  • Eactly same is happenning for me just now on the same system. I have found no solution.. – user2194122 Aug 05 '20 at 09:56
  • What is your version of GDAL on Ubuntu? i.e. with the following command in a terminal: `gdalinfo --version` – stragu Aug 06 '20 at 02:10

2 Answers2

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Update: rgdal 1.5-16 has been released with a fix for Ubuntu 18.04. Upgrading GDAL and PROJ (if possible) is still recommended, and new versions can be obtained from UbuntuGIS or built from source directly.

Original answer: I contacted the rgdal maintainers about this error and they indicated that it is a known issue when building rgdal against out-of-date versions of GDAL and PROJ. To work around the error, they recommend installing a development version of the package by running:

install.packages("rgdal", repos="http://R-Forge.R-project.org")

Ubuntu 18.04 currently has GDAL 2.2.3 and PROJ 4.9.3. According to the rgdal page on CRAN, rgdal should still work with these versions of GDAL and PROJ, but they are far out of date compared to the upstream versions of both packages. The rgdal maintainers strongly recommend running the latest versions of GDAL and PROJ in order to take advantage of the latest fixes, improvements, and API changes.

Arnon
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1

This issue is now solved with the new release of rgdal_1.5-16 on CRAN.

https://twitter.com/RogerBivand/status/1291622288211750913?s=20

ze miguel
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