freepops needs to be update quicly if you want that all plugins works well (now is out version 0.0.31).
In the official home page you can find patches that have to be apply to the pkg. For example at the moment there is a patch for hotmail.lua so I made a little change at PKGBUILD:

pkgname=freepops
pkgver=0.0.31
pkgrel=1
pkgdesc="A program to convert webmail interfaces to pop3"
url="http://freepops.sourceforge.net/"
depends=('curl' 'expat')
backup=('etc/freepops/config.lua')
source=(http://dl.sourceforge.net/sourceforge/$pkgname/$pkgname-$pkgver.tar.gz freepopsd \
http://dl.sourceforge.net/sourceforge/$pkgname/hotmail.lua)
md5sums=('ff1d7b2553dd4092ba483d96a3917371' 'da3192c9261e839654bdaa02253de919'\
'98c6d3abf52b8618ac35927414c480b8')
build() {
cd $startdir/src/$pkgname-$pkgver
./configure.sh linux-slack
make || return 1
make DESTDIR=$startdir/pkg install
chmod 644 $startdir/pkg/etc/freepops/config.lua $startdir/pkg/usr/share/freepops/lua/*.lua $startdir/pkg/usr/share/man/man1/freepopsd.1
install -D -m755 $startdir/src/freepopsd $startdir/pkg/etc/rc.d/freepopsd
# Adding Patches
cd $startdir/src
for _patch in *.lua
do
install -D -m644 $_patch $startdir/pkg/usr/share/freepops/lua/$_patch
done
}

first of all I add the source of the patch (http://dl.sourceforge.net/sourceforge/$pkgname/hotmail.lua) and after I add a cycle "for" at the end of build() so, if a new patch come out, you need only to add it in the source list and it will be automatically add.