test android/soong/cc/config

https://stackoverflow.com/questions/46746229/building-android-msm-3-18-kernel-fails-on-soong-cc-config-test-on-
setsdclangvars

https://developer.qualcomm.com/forum/qdn-forums/software/snapdragon-llvm-compiler-android/33437

prebuilts/misc/linux-x86/ccache/ccache prebuilts/clang/host/linux-x86/clang-2690385/bin/clang++ -v

https://github.com/jeaye/color_coded/issues/169

$ pacman -Ql ncurses5-compat-libs | grep libtinfo
ncurses5-compat-libs /usr/lib/libtinfo.so.5

https://wiki.archlinux.org/index.php/Arch_User_Repository

http://allanmcrae.com/2015/01/replacing-makepkg-asroot/

runas -u nobody makepkg -si

https://wiki.archlinux.org/index.php/sudo

sudo -u nobody makepkg

usermod -a -G root john