Hi Jocelyn,
I am using my own wrapper from Eiffel-loop which has some minimal dependencies on the ES library.
For the Posix implementation I have changed it to use the headers and so modules from the distribution provided development package. 
I have looked into upgrading the Windows implementation but ran into a problem finding a complete set of prebuilt dlls. All the Windows ones I inspected here are incomplete: https://curl.haxx.se/download.html They have libcurl.dll, but there is no SSL dll. I don't really have the time to set up a build from source. I decided to make do with the existing implementation for Windows.