Bypass qpdf checks

[maelle]

• From what I see https://github.com/wch/r-source/blob/3ab6f3a3a25a3a7cd557c278d2c8b0a6eaa32921/src/library/tools/R/check.R#L633-L637 you can only avoid the warning by

  • not using --as-cran i.e. running devtools::check(cran = FALSE) (which might make other warnings/errors/notes disappear).
  • making qpdf available somewhere (but that doesn't seem to be possible for you) and setting the environment variable R_QPDF to its location. It should be found by https://github.com/wch/r-source/blob/2f0b0f63c7ad4415f622e1aa55de5409fa09a446/src/library/tools/R/admin.R#L1040 (I haven't tested setting this environment variable but devtools::check() has an env_vars argument).

• Related thread on this forum: QPDF is needed (error package).