makepkg 4.2 killed --asroot.

A dirty fix that works from the yaourt github thread.

Edit /usr/bin/makepkg

Add asroot to OPT_LONG (line 3366). 

Search for "OPT_LONG".

OPT_LONG=('allsource' 'check' 'clean' 'cleanbuild' 'config:' 'force' 'geninteg'
          'help' 'holdver' 'ignorearch' 'install' 'key:' 'log' 'noarchive' 'nobuild'
          'nocolor' 'nocheck' 'nodeps' 'noextract' 'noprepare' 'nosign' 'pkg:' 'repackage'
          'rmdeps' 'sign' 'skipchecksums' 'skipinteg' 'skippgpcheck' 'source' 'syncdeps'
          'verifysource' 'version' 'asroot')

Remove EUID check (line 3577).

Search for "EUID".

if (( ! INFAKEROOT )); then
    if (( EUID == 0 )); then
        #error "$(gettext "Running %s as root is not allowed as it can cause permanent,\n\
#catastrophic damage to your system.")" "makepkg"
        #exit 1 # $E_USER_ABORT
        plain "$(gettext "Running as root restored by Orc ;)")"
    fi

 This dirty fix helped me install snort on my pi once again. Remember running makepkg as root will make baby jesus cry.