A common issue while trying to use https://github.com/Vindaar/ggplotnim on Windows is the fact that it is not easy to satisfy the full list of dll for Cairo.
In an issue (Vindaar/ggplotnim#57) and related gist (https://gist.github.com/Vindaar/6cb4e93baff3e1ab88a7ab7ed1ae5686) one of the best options seems to be to install emacs and add its bin folder to the path.
Using a dll dependency analyzer (https://github.com/lucasg/Dependencies, found through SO: https://stackoverflow.com/questions/7378959/how-to-check-for-dll-dependency), I was able to list all the dlls required, which are the following 17 files (including libcairo-2.dll, total around 9MB).
So another solution instead of installing emacs is to download the dlls (see link to libcairo-deps.rar in comment) and copy them in ~\.nimble\bin.
List of all recursive dependencies for libcairo-2.dll:
- libbz2-1.dll
- libcairo-2.dll
- libexpat-1.dll
- libfontconfig-1.dll
- libfreetype-6.dll
- libgcc_s_seh-1.dll
- libglib-2.0-0.dll
- libgraphite2.dll
- libharfbuzz-0.dll
- libiconv-2.dll
- libintl-8.dll
- libpcre-1.dll
- libpixman-1-0.dll
- libpng16-16.dll
- libstdc++-6.dll
- libwinpthread-1.dll
- zlib1.dll
libcairo-deps.rar:
https://drive.google.com/file/d/1MCGtVHoCEzIuqzma8jgmgr2bzYgxfeqW/view?usp=sharing