a msys2/mingw64 build of Calculix (see www.dhondt.de) a free finite element solver
#build process closely follows http://hillyuan.blogspot.de/2013/10/build-calculix261-in-mingw64.html #MT --> Flag: -O
#build process closely follows http://hillyuan.blogspot.de/2013/10/build-calculix261-in-mingw64.html #MT --> Flag: -O