$ sudo pacman -S weechat
resolving dependencies...
looking for conflicting packages...

Packages (1) weechat-3.6-1

Total Download Size:    2.74 MiB
Total Installed Size:  26.77 MiB

:: Proceed with installation? [Y/n] 
:: Retrieving packages...
 weechat-3.6-1-x86_64 downloading...
checking keyring...
checking package integrity...
loading package files...
checking for file conflicts...
:: Processing package changes...
installing weechat...
Optional dependencies for weechat
    aspell: spellchecker support
    guile: support for guile scripts [installed]
    lua: support for lua scripts
    perl: support for perl scripts [installed]
    python: support for python scripts
    ruby: support for ruby scripts
    tcl: support for tcl scripts
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...