Setting up toolchain in MacOS failed with "file system is not case-sensitive" error

[John Kuang]

I was following
https://esp-idf.readthedocs.io/en/lates ... ratch.html
step by step to setup toolchain on my MacBook Pro (macOS High Sierra Version 10.13.2).
Everything was OK until
./ct-ng build
where I got an
[ERROR] Your file system in '/Users/kuang/esp/crosstool-NG/.build' is *not* case-sensitive!
Ask for help and thanks in advance.

[kolban]

Looking at the docs here,

http://esp-idf.readthedocs.io/en/latest ... rom-source

I seem to see a paragraph that reads:

"Create a case-sensitive filesystem image: ...". Might this be the issue?