Pablo Alvarez-2 wrote:
>
>
> Hello,
> We (two mac users) have been attempting to install rgdal from
> "http://www.kyngchaos.com/software:frameworks";, given that it is not
> available as a binary on the CRAN (binaries) of the "Package Installer".
>
>
The GDAL library contains an impressive collection of utilities and also
leverages several other libraries such as HDF, netCDF and PROJ4, just to
name a few. Building and distributing a binary R package that contains the
GDAL library bloats the size of the package and causes redundancies if a
user already has GDAL installed somewhere else on their system. It also
creates a lot of extra work for the package maintainer.
This is probably done for Windows because a run-of-the-mill Windows system
is utterly incapable of building anything from source. Linux and OS X
systems are perfectly capable, so it is expected that you can build the
package from source and use your installed version of GDAL.
Pablo Alvarez-2 wrote:
>
>
> I have also tried to solve this problem by looking on the net for an old
> question, and though I have found it, the answers do not help very much
> because our porgraming skills are embryonic.
>
>
> Our GIS professor has suggested we ask you guys how to proceed with the
> CRAN (source). Any suggestions or direction to an old document dealing
> with this?
>
> Thank you very much for your help,
> Pablo and Margarita
> PS. We have already installed: GDAL (for QGIS) and "sp" (for R)
>
>
I've built the GDAL library and installed rgdal a few times-- it's typically
one of the first things I do after wiping or reinstalling my OS X system or
a Linux system. Building software from source can be a tricky business with
a steep learning curve-- but once you figure out some of the patterns it
becomes quite doable (as long as those darn platform-specific issues don't
cut you off at the kneecaps).
The rgdal package contains a Configure script that is run during
installation and attempts to locate the GDAL library. When building software
on Unix/Linux, there are three kinds of folders containing various items of
interest that compilers and linkers will frequently pester you about. These
are:
* "lib" folders-- these contain libraries that hold code you are trying to
use.
* "include" folders-- these contain header files that tell the compiler
how to use
the code in the libraries.
* "bin" folders-- these contain scripts and programs that may help the
Configure script,
or the program you are building do the things they do.
I suspect the Configure script for the rgdal package only checks standard
Unix/Linux folders such as /usr/bin or /usr/local/lib. The Framework package
provided by William Kyngesburye installs GDAL Mac-Style, which means these
folders are located in:
/Library/Frameworks/GDAL.framework/unix/
And
/Library/Frameworks/PROJ.framework/unix/
Fortunately, R allows us to pass hints to configure during package
installation in order to help it find what it is looking for.
So, grab the source tarball of rgdal from:
http://cran.r-project.org/web/packages/rgdal/index.html
I'm also using the PROJ4 and GDAL frameworks installed by the GDAL Complete
framework, available from:
http://www.kyngchaos.com/software:frameworks/
Also, make sure you have installed the "Developer Tools" contained on your
OS X System Software CD as these provide C compilers and other tools needed
to build the code in the rdal package.
Now pop open a Terminal. Assuming you saved the package in your Downloads
folder, execute the following.
cd ~/Downloads
R CMD INSTALL rgdal_0.6-20.tar.gz
R will start to install the package, and then wipe out with a message that
includes:
Error: gdal-config not found
The gdal-config script distributed with GDAL could not be found.
If you have not installed the GDAL libraries, you can
download the source from http://www.gdal.org/
If you have installed the GDAL libraries, then make sure that
gdal-config is in your path. Try typing gdal-config at a
shell prompt and see if it runs. If not, use:
--configure-args='--with-gdal-config=/usr/local/bin/gdal-config' echo with
appropriate values for your installation.
gdal-config is a little script who's sole purpose is to tell Configure
scripts whatever they want to know about a GDAL installation. Scripts and
programs that accompany a library are commonly installed in a "bin" folder.
So given what I've noted above about the install location used by the GDAL
framework, we can give rgdal's Configure script a hint:
R CMD INSTALL --configure-args=\
"--with-gdal-config=/Library/Frameworks/GDAL.framework/unix/bin/gdal-config"
\
rgdal_0.6-20.tar.gz
The R installer now spits out another error:
Error: proj_api.h not found.
If the PROJ.4 library is installed in a non-standard location,
use --configure-args='--with-proj-include=/opt/local/include'
for example, replacing /opt/local/* with appropriate values
for your installation. If PROJ.4 is not installed, install it.
PROJ4 has no "proj4-config" script, so we will probably need to tell
Configure where both the lib and include folders are. The following command:
R CMD INSTALL --configure-args=\
"--with-gdal-config=/Library/Frameworks/GDAL.framework/unix/bin/gdal-config
\
--with-proj-lib=/Library/Frameworks/PROJ.framework/unix/lib \
--with-proj-include=/Library/Frameworks/PROJ.framework/unix/include" \
rgdal_0.6-20.tar.gz
Should provide Configure with enough information to build and install the
package.
When smashed onto one line (for easier copying and pasting) the above
command is:
R CMD INSTALL
--configure-args="--with-gdal-config=/Library/Frameworks/GDAL.framework/unix/bin/gdal-config
--with-proj-lib=/Library/Frameworks/PROJ.framework/unix/lib
--with-proj-include=/Library/Frameworks/PROJ.framework/unix/include"
rgdal_0.6-20.tar.gz
Hope this helps!
-Charlie
-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
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