What should I do to make it work ? (I'm on Windows 7 64 bits)
I have already made it work a few months ago though I think I was on Vista 32 bits then.
I found here
Nota:, if an error window opens complaining about libgmp-10.dll missing, then you used a bugged version of the MinGW installer
(some DLLs are not correctly installed). To fix the problem, just type the following commands:
cp /mingw/bin/libgmp-10.dll /mingw/libexec/gcc/mingw32/4.5.2
cp /mingw/bin/libmpc-2.dll /mingw/libexec/gcc/mingw32/4.5.2
cp /mingw/bin/libmpfr-1.dll /mingw/libexec/gcc/mingw32/4.5.2
cp /mingw/bin/libiconv-2.dll /mingw/mingw32/bin
cp /mingw/bin/libintl-8.dll /mingw/mingw32/bin
But I only found libgmp-3.dll in /mingw/bin/
I tried to reinstall multiple times but nothing fixed.