Feel free to use the pkgsrc binaries I have built for the mipsel CI20 Creator board
https://45.76.81.249:8000/pkgsrc/
I have used GCC 7.2.0 on the stock Linux mipsbox 3.0.8-00847-g2e5af7d #1 SMP PREEMPT Wed Jun 24 10:10:52 BST 2015 mips GNU/Linux
Only thing I have added is the new symlink to libstdcc++.so.6.0.24 from the GCC build to /usr/lib/mipsel-linux-gnu because of GLIBCXX_3.4.21 requirement in libstdcc++.so.6 during Node.JS build
Will keep the repo updated as I progress hopefully further.