[Archlinux] How to compile the package of pacman

Important paragraph:

Pacman +---> Configuration file
               +
               +-> RootDir = The path which install the binary file
               |
               +-> DBPath  = The Database of pacman
               |      +      Execute "./pacman -Syy" will create local and sync
               |      |              which under /var/lib/pacman
               |      |
               |      |               sync = Put all DB under this path
               |      |
               |      +----> According the setting(below) in configuration file
               |             [core]
               |             [extra]
               |             [community]
               |
               +-> CacheDir= Put all package which download from internet.

Download pacman to compile.
git clone git@github.com:Jumbo88888/Linux_Cross_Compiler_tools.git


./pacman -Syy
After synchronize package databases, the file of db are stored under following path.
./var/lib/pacman/sync/core.db
./var/lib/pacman/sync/extra.db
./var/lib/pacman/sync/community.db
./var/lib/pacman/sync/archlinuxfr.db

Ignore the signed keys check
vim etc/pacman.conf
#SigLevel    = Required DatabaseOptional -->
SigLevel    = Never

./pacman -S geany
Some package store under following path.
After download the package will start to install the package.
./var/cache/pacman/pkg/linux-api-headers-4.5.5-1-x86_64.pkg.tar.xz

Reference:

• Cannot import keys