need some help with installing blackarch over arch

[maximilien1990]

im trying to install the blackarch tools on arch but i get this
unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description
warning: nfcutils: unknown key 'makepkgopt' in package description

for about a few hundred packages. whats the deal with that?

[noraj]

At what stage? What command did you issued?