Error(s) in re-building vignettes:
  ...
--- re-building ‘implicitization.Rmd’ using rmarkdown

Quitting from implicitization.Rmd:127-164 [unnamed-chunk-3]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `library()`:
! there is no package called 'flextable'
---
Backtrace:
    ▆
 1. └─base::library(flextable)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'implicitization.Rmd' failed with diagnostics:
there is no package called 'flextable'
--- failed re-building ‘implicitization.Rmd’

--- re-building ‘paths.Rmd’ using rmarkdown
--- finished re-building ‘paths.Rmd’

--- re-building ‘polarzonoid-guide.Rmd’ using rmarkdown
--- finished re-building ‘polarzonoid-guide.Rmd’

--- re-building ‘rotations.Rmd’ using rmarkdown

Quitting from rotations.Rmd:376-383 [unnamed-chunk-12]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `plot.new()`:
! could not open file '/tmp/RtmpphByAG/plot025.png'
---
Backtrace:
    ▆
 1. └─global WebMfromrotationlist(circle, index = 4, vpsize = c(480, 480))
 2.   └─polarzonoid::plotarcs(...)
 3.     └─graphics::plot.default(...)
 4.       └─graphics::plot.new()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'rotations.Rmd' failed with diagnostics:
could not open file '/tmp/RtmpphByAG/plot025.png'
--- failed re-building ‘rotations.Rmd’

--- re-building ‘unknot.Rmd’ using rmarkdown
--- finished re-building ‘unknot.Rmd’

SUMMARY: processing the following files failed:
  ‘implicitization.Rmd’ ‘rotations.Rmd’

Error: Vignette re-building failed.
Execution halted