crossdev stores the EXTRA_ECONF options w/o quotes
Minor bug in crossdev, as the title says its storing the options I
passed without the quotes. That means emerge spills some messages about
'command not found' referring to the second options on those lines.
Here's an example of what I'm doing (mind you it doesn't work for what
its intended -- i.e. the mingw-w64 tools are not quite right, they are
missing the 32 bit libc++ and other details):