As a precaution. I am reverting from this version of mingw 4.8.2 (-rev4) http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Wi...

To this version (-rev3), the exact version that Qt 4.8.6 instructions you to use: http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Wi...

Reverting did not fix the libssh build failure, George's patch did though. I will send another email about that.