Manjaro

yay
sudo pacman -S yay base-devel okular yay cherrytree

xdg-mime default okularApplication_pdf.desktop application/pdf

https://github.com/Strit/manjaro-torrents/tree/master/community/bspwm/archive

http://manjaro.github.io/Manjaro-bspwm-16.05-released/

cuda
https://douglasrizzo.com.br/cuda-manjaro/ yay cuda install

https://www.youtube.com/watch?v=g7YgZZhkS90 Tutorial: 2019 INSTALL CUDA C onto Manjaro.

https://www.youtube.com/watch?v=UtqA8LW0Ke0

gcc5

 * git clone https://aur.archlinux.org/gcc5.git && cd gcc5 # PKBUILD file
 * 'makepkg --syncdeps && makepkg -si compiles and installs as per PKGBUILD file

https://gist.github.com/slizzered/a9dc4e13cb1c7fffec53 install gcc4.9 with pacaur. Use https://aur.archlinux.org/packages/aurman/ as pacaur is unmaintained.

git clone https://aur.archlinux.org/aurman.git. makepkg --syncdeps && makepkg -si
 * aurman -S gcc5
 * aurman -S gcc49

https://fusion809.github.io/how-to-create-archlinux-repository/

https://forum.manjaro.org/t/how-to-compile-with-old-version-of-gcc/41537/8

https://wiki.archlinux.org/index.php/Arch_User_Repository set /etc/makepkg.conf the makeflags to -j4 or however many processors you have.

https://aur.archlinux.org/packages/gcc5/