Hi all,
given the availability of msys2 tools http://www.msys2.org/ on windows 64 is in theory possible to compile pd and pd externals for win64?
thanks!

Yes, it just needs a lot of testing and debugging:

There's a Purr Data branch with some initial changes to allow compilation under the msys2 64bit environment here:

https://git.purrdata.net/jwilkes/purr-data/tree/handle-mingw64-correctly

However, I haven't changed the build instructions-- which may have some 32-bit specific parts to it.

I just merged master into that branch, so if you want to experiment with compiling it you can pull from that branch.

I compile libpd for Windows 64 and it seems to work.
The only thing to define is -DPD_LONGINTTYPE="long long".
The pull request with the branch that I use.