MSYS:
Create: Vivado_HLS\2015.2\msys\var\lib\mingw-get\data Copy defaults.xml from existing msys installation to Vivado_HLS\2015.2\msys\var\lib\mingw-get\data\defaults.xml
From mingw shell do: mingw-get install g++
Add #define NO_INLINE to math.h http://ehc.ac/p/mingw/bugs/2250/