-w64 environment through &lsquo;<tt>mingw64_shell.bat</tt>&rsquo; or
&lsquo;<tt>mingw32_shell.bat</tt>&rsquo; that should be used instead of the environment
provided by &lsquo;<tt>msys2_shell.bat</tt>&rsquo;.

</li><li> Building using MSYS2 can be sped up by disabling implicit rules in the
Makefile by calling <code>make -r</code> instead of plain <code>make</code>. This
speed up is close to non-existent for normal one-off builds and is only
noticeable when running make for a second time (for example during
