Error(s) in re-building vignettes:
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--- re-building 'Building_Packages.Rmd' using rmarkdown
v Creating '/tmp/Rtmp6wDWUq/fakepack/'
v Setting active project to '/tmp/Rtmp6wDWUq/fakepack'
v Creating 'R/'
v Writing 'DESCRIPTION'
v Writing 'NAMESPACE'
v Setting active project to '<no active project>'
Error: processing vignette 'Building_Packages.Rmd' failed with diagnostics:
'old' is longer than 'new'
--- failed re-building 'Building_Packages.Rmd'

--- re-building 'An_Introduction_to_fakemake.Rasciidoc' using rasciidoc
Warning in run_knit(file_name, knit = knit, envir = envir, write_to_disk = write_to_disk) :
  Setting option knit to TRUE based on the file contents!


processing file: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/fakemake.Rcheck/vign_test/fakemake/vignettes/An_Introduction_to_fakemake.Rasciidoc
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output file: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/fakemake.Rcheck/vign_test/fakemake/vignettes/An_Introduction_to_fakemake.asciidoc

Can't find program `asciidoc`. Please install first (http://www.asciidoc.org).
cloning into '/tmp/Rtmpuj4i3A/asciidoc'...
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Receiving objects:  91% (7341/8066), 27125 kb
Receiving objects: 100% (8066/8066), 29216 kb, done.
Can't find program `asciidoc`. Please install first (http://www.asciidoc.org).
Can't find program `source-highlight`. Please install first (http://www.gnu.org/software/src-highlite/). 
--- finished re-building 'An_Introduction_to_fakemake.Rasciidoc'

SUMMARY: processing the following file failed:
  'Building_Packages.Rmd'

Error: Vignette re-building failed.
Execution halted