libproxy needs to be rebuilt because of broken perl bindings:
$this->bbcode_second_pass_code('', '$ pacman -Q perl libproxy
perl 5.24.0-1
libproxy 0.4.12-2
$ perl -e "use Net::Libproxy;"
/build/libproxy/src/libproxy-0.4.12/bindings/perl/src/Libproxy.c: loadable library and perl binaries are mismatched (got handshake key 0x8e00080, needed 0x9000080)
')