[bug]: Lacking determination of prefix case in make

[ittayd]

What happened?

The code in zinit-make-base-hook is: if grep -w -- "PREFIX =" ${dir}/[Mm]akefile >/dev/null; then, but tj/git-exras for example has PREFIX ?= /usr/local

Steps to reproduce

.

Relevant output

Screenshots and recordings

No response

Operating System & Version

OS: linux-gnu | Vendor: ubuntu | Machine: x86_64 | CPU: x86_64 | Processor: x86_64 | Hardware: x86_64

Zsh version

zsh 5.9 (x86_64-ubuntu-linux-gnu)

Terminal emulator

xterm-256color

If using WSL on Windows, which version of WSL

None

Additional context

No response

Code of Conduct

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