msys2 64 bit: help help!

Simon Peyton Jones simonpj at
Mon Jun 27 08:01:28 UTC 2016

Friends, esp Tamar,

I am in happy possession of a new Surface Book, running Windows 10, which is delightful - except that I can't make the msys64 installation work, which is crucial for GHC.  Can any of you help?

*        I install it from here:, which seems to be the canonical place.  The actual 64-bit exe seems to be msys2-x86_64-20160205.exe.

*        Installation goes fine

*        But when I launch the "MinGW-w54 Win64 shell" from the Start menu, the screen flashes as if it is briefly putting up a window, but then the window disappears.

*        Each time I do this the task manager shows that there is another running 'mintty.exe'.   But it has no visible window

Does anyone have any idea what I can do or how I can investigate?  I can't do any GHC development without this!



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