toolchain-sudo.sh doesn't work on macOS with brew because running brew as root has been no longer unsupported

[yaplus]

When trying to install the toolchain to /usr/local on Mac with Homebrew, an error

Couldn't find dependencies:
  - libarchive
  - libssl

has occurred in depends/check-dependencies.sh, because running brew as root has been no longer unsupported.

The error seems to be caused by the following line, which is running brew --version as root in toolchain-sudo.sh:

psptoolchain/depends/check-dependencies.sh

Lines 96 to 98 in 79b1cf8

	if brew --version 1>/dev/null 2>&1; then
	header_paths+=("`brew --prefix`/opt/readline/include")
	header_paths+=("`brew --prefix`/opt/libarchive/include")

[carstene1ns]

So --version works not, but getting the prefix works?

I think using sudo might be a bit overkill then. We could use command -v brew to check instead.

[carstene1ns]

Okay, looks like we can get away with this:
https://github.com/Homebrew/brew/blob/master/Library/Homebrew/brew.sh#L439