OK, had some more time to try and get this working today. Tried a fresh install of mingw64, using the latest autobuild from here:
http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/and the MSYS located nearby. There was nothing labeled "2.0.1" (?)...
Cmake took a little bit of prompting to find the compilers, kept asking where "windres.exe" was, and even when I got it to finally accept everything by the rather extreme use of
cmake -G "MSYS Makefiles" -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++ -DCMAKE_RC_COMPILER=x86_64-w64-mingw32-windres -DCMAKE_INSTALL_PREFIX:PATH=/c/build -DPTHREAD_INCLUDE_DIR=/include/ -DZLIB_INCLUDE_DIR=/include ..
... which still doesn't do much good, as cmake then seems to presumes that because I've specified compilers, it can ignore the "MSYS Makefiles" part and look for NMake anyway, when I type "make" (and then complains about not being able to find cl - and this with "# Generated by "MSYS Makefiles" Generator, CMake Version 2.8" clear as day at the top of the make file

)
Oh yes, and no matter which g++ / gcc cmake says it's using, it always spits out
-- Checking for pthreads
-- *********************
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - no
which wasn't a problem with regular mingw.
I must confess, I'm a little stumped. Any chance I could get a more specific list of required mingw64 and msys installers? The mingw64 project on SF in particular has directories, snapshot variants and personal builds coming out of more orifices than I care to mention
