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