Knowing that the package rgeos, from the R language, requieres a prior installation of geos libraries, I installed, both, libgeos and libgeos-c1 (3.2.2), using the synaptic installer in my Ubuntu 12.04 (32 bit) machine.

Then I tried to install rgeos directly from the R console, and it issued a message in the sense that geos-config was not found. The output is as follows:

> install.packages("rgeos")

Installing package(s) into ‘/home/checo/R/i486-pc-linux-gnu-library/2.15’

(as ‘lib’ is unspecified)

also installing the dependency ‘sp’



probando la URL 'http://cran.rstudio.com/src/contrib/sp_1.0-9.tar.gz'

Content type 'application/x-gzip' length 882102 bytes (861 Kb)

URL abierta

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downloaded 861 Kb



probando la URL 'http://cran.rstudio.com/src/contrib/rgeos_0.2-19.tar.gz'

Content type 'application/x-gzip' length 221471 bytes (216 Kb)

URL abierta

==================================================

downloaded 216 Kb



* installing *source* package ‘sp’ ...

** package ‘sp’ successfully unpacked and MD5 sums checked

** libs

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c R    centroid.c -o Rcentroid.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c gcdist.c -o gcdist.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c init.c -o init.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c pip.c -o pip.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c pip2.c -o pip2.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c sp_xports.c -o sp_xports.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c surfaceArea.c -o surfaceArea.o

gcc -std=gnu99 -I/usr/share/R/include -DNDEBUG      -fpic  -O3 -pipe  -g  -c zerodist.c -o zerodist.o

gcc -std=gnu99 -shared -o sp.so Rcentroid.o gcdist.o init.o pip.o pip2.o sp_xports.o surfaceArea.o zerodist.o -L/usr/lib/R/lib -lR

installing to /home/checo/R/i486-pc-linux-gnu-library/2.15/sp/libs

** R

** data

** demo

** inst

** preparing package for lazy loading

** help

*** installing help indices

** building package indices

** installing vignettes

   ‘intro_sp.Rnw’ 

   ‘over.Rnw’ 

** testing if installed package can be loaded



* DONE (sp)

* installing *source* package ‘rgeos’ ...

** package ‘rgeos’ successfully unpacked and MD5 sums checked

configure: CC: gcc -std=gnu99

configure: CXX: g++

configure: rgeos: 0.2-17

checking for /usr/bin/svnversion... no

configure: svn revision: 394

checking geos-config usability... 

./configure: line 1385: geos-config: command not found

no

configure: error: geos-config not usable

ERROR: configuration failed for package ‘rgeos’

* removing ‘/home/checo/R/i486-pc-linux-gnu-library/2.15/rgeos’

Warning in install.packages :

  installation of package ‘rgeos’ had non-zero exit status

Forgive my ignorance, but I don't know where this file, "geos-config", comes from: should it be generated by the gcc compilations above, or should it be previously installed when the libgeos libraries were intalled?

I learnt, from another machine, that "geos-config" is an executable and that it should be installed in /usr/bin.

Do you have any idea on what's wrong with my procedure?

Thanks,

-Sergio.