Error(s) in re-building vignettes:
--- re-building ‘decision-vegan.Rnw’ using Sweave
Loading required package: vegan
Loading required package: permute
Loading required package: lattice
This is vegan 2.5-6
Error: processing vignette 'decision-vegan.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'decision-vegan.tex' failed.
LaTeX errors:
! LaTeX Error: File `ifxetex.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.134 \RequirePackage{ifxetex}[2006/08/21]
                                          ^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘decision-vegan.Rnw’

--- re-building ‘diversity-vegan.Rnw’ using Sweave
Loading required package: permute
Loading required package: lattice
This is vegan 2.5-6
forced matching of 'tree' labels and 'comm' names
Warning in cor(x > 0) : the standard deviation is zero
Warning in cor(x > 0) : the standard deviation is zero
Warning in betadisper(z, Management) :
  some squared distances are negative and changed to zero
Error: processing vignette 'diversity-vegan.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'diversity-vegan.tex' failed.
LaTeX errors:
! LaTeX Error: File `ltxcmds.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.108 \RequirePackage{ltxcmds}[2010/11/12]
                                          ^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘diversity-vegan.Rnw’

--- re-building ‘intro-vegan.Rnw’ using Sweave
Loading required package: permute
Loading required package: lattice
This is vegan 2.5-6
Error: processing vignette 'intro-vegan.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'intro-vegan.tex' failed.
LaTeX errors:
! LaTeX Error: File `ifvtex.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.7 \RequirePackage
                   {pdftexcmds}^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘intro-vegan.Rnw’

--- re-building ‘partitioning.Rnw’ using Sweave
Loading required package: permute
Loading required package: lattice
This is vegan 2.5-6
Error: processing vignette 'partitioning.Rnw' failed with diagnostics:
Running 'texi2dvi' on 'partitioning.tex' failed.
LaTeX errors:
! LaTeX Error: File `ifvtex.sty' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)

! Emergency stop.
<read *> 
         
l.7 \RequirePackage
                   {pdftexcmds}^^M
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘partitioning.Rnw’

--- re-building ‘FAQ-vegan.Rmd’ using knitr
--- finished re-building ‘FAQ-vegan.Rmd’

SUMMARY: processing the following files failed:
  ‘decision-vegan.Rnw’ ‘diversity-vegan.Rnw’ ‘intro-vegan.Rnw’
  ‘partitioning.Rnw’

Error: Vignette re-building failed.
Execution halted