crossdev -t mingw64 --g 6.4.0-r3 --b 2.31.1-r1 --k 4.12.14
-
 * crossdev version:      20180918
 * Host Portage ARCH:     amd64
 * Target Portage ARCH:   amd64
 * Target System:         x86_64-w64-mingw32
 * Stage:                 4 (C/C++ compiler)
 * USE=multilib:          no
 * ABIs:                  amd64

 * binutils:              binutils-2.31.1-r1
 * gcc:                   gcc-6.4.0-r3
 * libc:                  mingw64-runtime-[latest]

 * CROSSDEV_OVERLAY:      /usr/portage/local
 * PORT_LOGDIR:           /var/tmp/portage-logs
 * PORTAGE_CONFIGROOT:    /
 * Portage flags:

 * leaving sys-devel/binutils in /usr/portage/local
 * leaving sys-devel/gcc in /usr/portage/local
 * leaving dev-util/mingw64-runtime in /usr/portage/local
 * leaving sys-devel/gdb in /usr/portage/local
 * leaving metadata/layout.conf alone in /usr/portage/local

 * Log: /var/tmp/portage-logs/cross-x86_64-w64-mingw32-binutils.log
 * Emerging cross-binutils ...                                                   [ ok ]
 * Log: /var/tmp/portage-logs/cross-x86_64-w64-mingw32-mingw64-runtime-headers.log 
 * Emerging cross-mingw64-runtime-headers ...                                    [ ok ]
 * Log: /var/tmp/portage-logs/cross-x86_64-w64-mingw32-gcc-stage1.log
 * Emerging cross-gcc-stage1 ...                                                 [ ok ]
 * Log: /var/tmp/portage-logs/cross-x86_64-w64-mingw32-mingw64-runtime.log
 * Emerging cross-mingw64-runtime ...                                            [ ok ]
 * Log: /var/tmp/portage-logs/cross-x86_64-w64-mingw32-gcc-stage2.log
 * Emerging cross-gcc-stage2 ...                                                 [ ok ]