Travis CI Error: gifski config

[nspyrison]

Is there some YAML magic needed? see:
https://travis-ci.community/t/error-configuration-failed-for-package-magick/1674

From the bottom of travis CI:

ERROR: configuration failed for package ‘gifski’
* removing ‘/home/travis/R/Library/gifski’
Error in i.p(...) : 
  (converted from warning) installation of package ‘gifski’ had non-zero exit status
Calls: <Anonymous> ... with_rprofile_user -> with_envvar -> force -> force -> i.p
Execution halted
The command "Rscript -e 'deps <- devtools::dev_package_deps(dependencies = NA);devtools::install_deps(dependencies = TRUE);if (!all(deps$package %in% installed.packages())) { message("missing: ", paste(setdiff(deps$package, installed.packages()), collapse=", ")); q(status = 1, save = "no")}'" failed and exited with 1 during .
Your build has been stopped.

[nspyrison]

Note that gifski is in the suggests field for gganimate.

[nspyrison]

has built without this error since.