When running the checks for my R-package (via devtools::check()) I face the warning \'\'qpdf\' is needed for checks on size reduction of PDFs. I found
devtools::check()
\'\'qpdf\' is needed for checks on size reduction of PDFs
Setup MSVC environment, then configure and build as follows:
./config-msvc make
Here is a more detailed steps: https://github.com/qpdf/qpdf/blob/master/README-windows.md
Hope it helps.