actually I did this:

cd $HOME/Library/Caches/Homebrew

tar xf delve-*.gz

go into directory ( mine is delve-1.0.0-rc.1 )

sh scripts/gencert.sh

it will asks for password, and you're done.

After that just re run brew install go-delve/delve/delve

and it will pass without problems

run this before brew install go-delve/delve/delve work for me'

参考：

https://github.com/derekparker/delve/wiki/Installation-on-OSX

https://github.com/go-delve/homebrew-delve/issues/20