Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: spocc
Warning in library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'spocc'
Installing package into '/home/ripley/R/Lib32'
(as 'lib' is unspecified)
also installing the dependencies 'rgbif', 'V8'

trying URL 'http://cran.us.r-project.org/src/contrib/rgbif_0.9.7.tar.gz'
Content type 'application/x-gzip' length 684603 bytes (668 KB)
==================================================
downloaded 668 KB

trying URL 'http://cran.us.r-project.org/src/contrib/V8_1.2.tar.gz'
Content type 'application/x-gzip' length 325718 bytes (318 KB)
==================================================
downloaded 318 KB

trying URL 'http://cran.us.r-project.org/src/contrib/spocc_0.6.0.tar.gz'
Content type 'application/x-gzip' length 756245 bytes (738 KB)
==================================================
downloaded 738 KB

* installing *source* package ‘V8’ ...
** package ‘V8’ successfully unpacked and MD5 sums checked
Using PKG_CFLAGS=-I/usr/include/v8-3.14
Using PKG_LIBS=-lv8
------------------------- ANTICONF ERROR ---------------------------
Configuration failed because  was not found. Try installing:
 * deb: libv8-3.14-dev (formerly: libv8-dev) (Debian, Ubuntu)
 * rpm: v8-314-devel (formerly: v8-devel) (Fedora, EPEL)
 * brew: v8-315 (OSX) -- NOT regular v8! Tap from homebrew/versions
 * csw: libv8_dev (Solaris)
To use a custom libv8, set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
--------------------------------------------------------------------
ERROR: configuration failed for package ‘V8’
* removing ‘/home/ripley/R/Lib32/V8’
Warning in install.packages("spocc", repos = "http://cran.us.r-project.org") :
  installation of package 'V8' had non-zero exit status
ERROR: dependency ‘V8’ is not available for package ‘rgbif’
* removing ‘/home/ripley/R/Lib32/rgbif’
Warning in install.packages("spocc", repos = "http://cran.us.r-project.org") :
  installation of package 'rgbif' had non-zero exit status
ERROR: dependencies ‘rgbif’, ‘V8’ are not available for package ‘spocc’
* removing ‘/home/ripley/R/Lib32/spocc’
Warning in install.packages("spocc", repos = "http://cran.us.r-project.org") :
  installation of package 'spocc' had non-zero exit status

The downloaded source packages are in
	'/tmp/RtmpfDaqCa/downloaded_packages'
Loading required package: ENMeval
Loading required package: dismo
Loading required package: raster
Loading required package: sp
Loading required package: rJava
Loading required package: parallel
Quitting from lines 38-52 (ENMeval-vignette.Rmd) 
Error: processing vignette 'ENMeval-vignette.Rmd' failed with diagnostics:
there is no package called 'spocc'
Execution halted