Failed to install package base64enc in R

This is the error I get when trying to install base64enc as a FastRweb dependency:

> install.packages('base64enc',,'http://www.rforge.net/')
Aviso en install.packages("base64enc", , "http://www.rforge.net/") :
 argument 'lib' is missing: using '/usr/local/lib/R/site-library'
probando la URL 'http://www.rforge.net/src/contrib/base64enc_0.1-3.tar.gz'
Content type 'application/x-gzip' length 7186 bytes
URL abierta
==================================================
downloaded 7186 bytes

* installing *source* package ‘base64enc’ ...
** libs
gcc -I/usr/share/R/include      -fpic  -std=gnu99 -O3 -pipe  -g -c base64.c -o base64.o
gcc -I/usr/share/R/include      -fpic  -std=gnu99 -O3 -pipe  -g -c uriencode.c -o uriencode.o
gcc -I/usr/share/R/include      -fpic  -std=gnu99 -O3 -pipe  -g -c utf8.c -o utf8.o
utf8.c: In function ‘utf8_check’:
utf8.c:75: warning: implicit declaration of function ‘XLENGTH’
gcc -shared -o base64enc.so base64.o uriencode.o utf8.o -L/usr/lib64/R/lib -lR
installing to /usr/local/lib/R/site-library/base64enc/libs
** R
** preparing package for lazy loading
** help
Aviso: ./man/dataURI.Rd:30: unknown macro '\href'
*** installing help indices
** building package indices ...
** testing if installed package can be loaded
Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  imposible cargar la biblioteca compartida '/usr/local/lib/R/site-library/base64enc/libs/base64enc.so':
  /usr/local/lib/R/site-library/base64enc/libs/base64enc.so: undefined symbol: XLENGTH
ERROR: loading failed
* removing ‘/usr/local/lib/R/site-library/base64enc’

The downloaded packages are in
        ‘/tmp/RtmpBfdYFV/downloaded_packages’
Mensajes de aviso perdidos
In install.packages("base64enc", , "http://www.rforge.net/") :
  installation of package 'base64enc' had non-zero exit status
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It looks like the package has been downloaded, but something is broken in my config or installation script. Thanks to