lzstd library cannot be found during installation

[FrancescoNegri]

Describe the bug

unigd package compilation failing due to 'lzstd' missing.

To Reproduce

Run install.packages("unigd") inside R terminal.

Expected behavior

unigd package is expected to successfully finish the building process.

Screenshots

Environment

• OS: Windows 11
• R version: 4.1.3
• unigd version: 0.1.1

Additional context

I am trying to set up R in a conda virtual environment, employing Visual Studio Code as IDE. Therefore, unigd is a dependency for "httpgd", that is required for the VS Code R extension plot viewer.

Whenever I try to run the install.packages("unigd") or install.packages("httpgd") command the following error is returned and the compilation is aborted.

g++ -shared -s -o unigd.dll tmp.def base_64.o compress.o cpp11.o draw_data.o page_store.o plot_history.o r_thread_posix.o r_thread_win32.o renderer_cairo.o renderer_json.o renderer_meta.o renderer_strings.o renderer_svg.o renderer_tikz.o renderers.o unigd.o unigd_dev.o unigd_external.o uuid.o -L../windows/harfbuzz-2.7.4/lib/x64 -lpng -lz -L../windows/cairo-1.16.0/lib/x64 -lcairo -lfreetype -lpixman-1 -lharfbuzz -lbz2 -liconv -lgdi32 -ltiff -ltiffxx -ljpeg -lzstd -lwebp -lsharpyuv -llzma -LC:/Users/FRANCE~1/MAMBAF~1/envs/R_env/lib/R/bin/x64 -lR
C:/Strawberry/c/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lzstd: No such file or directory
collect2.exe: error: ld returned 1 exit status
no DLL was created
ERROR: compilation failed for package 'unigd'
* removing 'C:/Users/Francesco/mambaforge/envs/R_env/Lib/R/library/unigd'

[HenningLorenzen-ext-bayer]

I would make sure that the proper 3rd-party C/C++ libraries are installed within RTools, using the pacman command.

The snippet below should do the trick in this case:

pacman -S mingw64/mingw-w64-x86_64-zstd mingw32/mingw-w64-i686-zstd

Related: #27