Error on Installation: PROJ available, but not proj_api.h

[wngrtn]

I am trying to install sf on Void Linux.

I have GEOS (3.7.1), GDAL (3.0.4), proj (6.3.1), and udunits (2.2.26) installed. The former three come with the OS and I compiled udunits from source. So all files should be in their "default" locations.

During configuration, R finds PROJ, but it doesn't seem to find proj_api.h, which is located in
/usr/include:

checking gdal.h usability... yes
checking gdal.h presence... yes
checking for gdal.h... yes
checking GDAL: linking with --libs only... yes
checking GDAL: /usr/share/gdal/pcs.csv readable... no
checking GDAL: checking whether PROJ is available for linking:... yes
checking GDAL: checking whether PROJ is available fur running:... yes
checking proj_api.h usability... no
checking proj_api.h presence... no
checking for proj_api.h... no
configure: error: proj_api.h not found in standard or given locations.
ERROR: configuration failed for package ‘sf’

How can I check where R is looking for proj_api.h and tell it where to look instead?

Looking through previous issues, I saw that installing pkg-config solved the problem for some users, but I already have it installed, as well.

[edzer]

If you have proj 6.3.1, sf should use proj.h, not proj_api.h.

[wngrtn]

@edzer, thanks! But how do I tell sf to use proj.h during installation?

[edzer]

If proj is properly installed, it finds it by itself.

[fdetsch]

@wngrtn, I ran into the same issue when trying to install sf from CRAN on a Linux machine equipped with GDAL (3.0.4), proj (7.0.0). In my case, installing the package via

remotes::install_github("r-spatial/sf")

solved the issue.

[edzer]

@wngrtn yes, try that; also we need the complete output of configure to be able to say something.

[rsbivand]

Released sf 0.8-1 has the if test "${PROJV1}" = "6"; then test, so PROJ 7 takes the PROJ < 6 branch, I think.

[Nowosad]

(Maybe it could be useful here - I created two new docker images:

1. https://hub.docker.com/repository/docker/jakubnowosad/rspatial_proj7 (with PROJ7, GDAL3, and GEOS3.8)
2. https://hub.docker.com/repository/docker/jakubnowosad/geocompr_proj7 (the same as above, but also with a large selection of #rspatial packages, including sf)

[edzer]

Thanks! I'm doing source installs with PROJ 7.0.0, but don't see any proj.pc being installed, so all pkg-config proj calls are failing. Am I doing something wrong? Tried both configure and cmake installs of PROJ.

[rsbivand]

My proj.pc ends up in /usr/local/lib/pkgconfig, and did install from a source build of 7.0.0 2 March.

[edzer]

This is on my dockerfile with custom installs of everything; I needed to run configure in PROJ as

./configure --prefix=/opt/proj --datadir=/opt/share

otherwise it would break (without --datadir).

[wngrtn]

@fdetsch, thank you! I was able to install sf from the master branch using

remotes::install_github("r-spatial/sf")

[alazarolop]

@edzer could your problem with proj.pc #1288 (comment) be solved with this fix? I ran in a similar issue while upgrading to Proj 7.0.0 and sf from CRAN and I fixed it this way.

[edzer]

Yes, specifying --datadir in the PROJ install fixed it.