Gem

Use the gem hosted on rubygems.org as an universal install method.

gem install bqm --no-wrapper

Gem: bqm

BlackArch

From the repository:

pacman -S bqm

From git:

blackman -i bqm

PKGBUILD: bqm

Manually:

$ git clone https://aur.archlinux.org/bqm.git
$ cd bqm
$ makepkg -fsri

With an AUR helper (Pacman wrappers), eg. pikaur:

$ pikaur -S bqm

AUR: bqm

bqm is included in Exegol.