Makefile: do not hardcode prefix on macOS

[barracuda156]

Installing anything in /usr should rather be avoided on macOS, and in any case there is no need to hardcode that.

[barracuda156]

Looks like it actually still tries to use /etc/xdg, i.e. overriding does not work correctly:

Executing:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_albafetch/albafetch/work/albafetch-6d34bb67a7e1eae7b750b8e807271bf3a728cb48" && /usr/bin/make -w install DESTDIR=/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_albafetch/albafetch/work/destroot 
make: Entering directory `/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_sysutils_albafetch/albafetch/work/albafetch-6d34bb67a7e1eae7b750b8e807271bf3a728cb48'
mkdir -p /usr/local/bin /etc/xdg
mkdir: /etc/xdg: Permission denied
make: *** [install] Error 1

[barracuda156]

Ah, that is because this does not work:

OS := $(shell uname -o 2> /dev/null)

Correct flag is -s:

36-25% uname -o
uname: illegal option -- o
usage: uname [-amnprsv]
36-25% uname -s
Darwin

[barracuda156]

@alba4k Ok, now this seems to work finally. Overrides were failing due to an invalid flag with uname.

P. S. Ubuntu CI fails on PATH_MAX, unrelated to this.

[alba4k]

yeah, I noticed. plan on fixing that once I get home

[alba4k]

wait though, uname -o worked on mac last time I tried and the output was Darwin. I need it to be -o because -s gives Linux on both Android and (GNU)/Linux

I guess a solution would be going back to what I was doing before, aka checking -s and then -o for android

[barracuda156]

Ok, let me drop the uname commit and just leave the prefix one. (Please fix uname then later.)

[alba4k]

will fix uname in an hour or so