Here you can find RTK for RTL8670, RTL8671 and RTL8672 cpu's
You need to setup i386 chroot environment https://wiki.debian.org/chroot
Make sure you place RTK it in /opt/Wive-DSL and make sure that you have those 2 symlinks
$ ln -s Wive-DSL Wive-DSL-2.6
$ ln -s Wive-DSL Wive
You need to isntall those packages
apt-get install git gcc binutils bzip2 flex python perl make \
grep diffutils unzip gawk getopt subversion libz-dev \
libc-dev ncurses-dev g++ bison
If you need clean build then
git clean -fdx; git clean -fdX; git reset --hard
Do not select Build libncurses
And just run
PATH=/opt/Wive-DSL/toolchain/bin:$PATH ./compile
or put export PATH=/opt/Wive-DSL/toolchain/bin:$PATH in to .bashrc
if you got some error
make subdirs