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Install httpgd from CRAN:

Or get the latest development version from GitHub:


See system requirements for troubleshooting.

System requirements

Depends on R version ≥ 4.0 on windows, and R ≥ 3.2 on linux and macOS (a C++ compiler with basic C++17 support is required).

Note that there is a rare bug in R versions < 4.1, that leads to some plots disappearing when ggplot2 plots are resized and deleted in a specific way.

Also see the unigd system requirements.