for building from source: GDAL >= 1.6.3, library
from http://trac.osgeo.org/gdal/wiki/DownloadSource and PROJ.4
(proj >= 4.4.9) from http://download.osgeo.org/proj/; GDAL OSX
frameworks built by William Kyngesburye at
http://www.kyngchaos.com/ may be used for source installs on
OSX.

c(
person("Roger", "Bivand", role = c("cre", "aut"), email = "Roger.Bivand@nhh.no"),
person("Tim", "Keitt", role = "aut"),
person("Barry", "Rowlingson", role = c("aut", "ctb")),
person("Edzer", "Pebesma", role = "ctb"),
person("Michael", "Sumner", role = "ctb"),
person("Robert", "Hijmans", role = "ctb"),
person("Even", "Rouault", role = "ctb"))
Roger Bivand [cre, aut],
Tim Keitt [aut],
Barry Rowlingson [aut, ctb],
Edzer Pebesma [ctb],
Michael Sumner [ctb],
Robert Hijmans [ctb],
Even Rouault [ctb]

Provides bindings to the Geospatial Data Abstraction Library ('GDAL') (>= 1.6.3) and access to projection/transformation operations from the 'PROJ.4' library. The 'GDAL' and 'PROJ.4' libraries are external to the package, and, when installing the package from source, must be correctly installed first. Both 'GDAL' raster and 'OGR' vector map data can be imported into R, and 'GDAL' raster data and 'OGR' vector data exported. Use is made of classes defined in the 'sp' package. Windows and Mac Intel OS X binaries (including 'GDAL', 'PROJ.4' and 'Expat') are provided on 'CRAN'.

Bindings for the 'Geospatial' Data Abstraction Library
Provides bindings to the 'Geospatial' Data Abstraction Library ('GDAL') (>= 1.6.3) and access to projection/transformation operations from the 'PROJ.4' library. The 'GDAL' and 'PROJ.4' libraries are external to the package, and, when installing the package from source, must be correctly installed first. Both 'GDAL' raster and 'OGR' vector map data can be imported into R, and 'GDAL' raster data and 'OGR' vector data exported. Use is made of classes defined in the 'sp' package. Windows and Mac Intel OS X binaries (including 'GDAL', 'PROJ.4' and 'Expat') are provided on 'CRAN'.

c(
person("Roger", "Bivand", role = c("cre", "aut"), email = "Roger.Bivand@nhh.no", comment=c(ORCID="0000-0003-2392-6140")),
person("Tim", "Keitt", role = "aut"),
person("Barry", "Rowlingson", role = c("aut", "ctb")),
person("Edzer", "Pebesma", role = "ctb"),
person("Michael", "Sumner", role = "ctb"),
person("Robert", "Hijmans", role = "ctb"),
person("Even", "Rouault", role = "ctb"))
Roger Bivand [cre, aut] (0000-0003-2392-6140),
Tim Keitt [aut],
Barry Rowlingson [aut, ctb],
Edzer Pebesma [ctb],
Michael Sumner [ctb],
Robert Hijmans [ctb],
Even Rouault [ctb]