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gnu-netcat is a dependency to fetchmail according to this error I got:
$ jaro fetch -D
(*) Jaro Mail v4.2 running on GNU/Linux
. System in /usr/local/share/jaromail
[D] Loading zlib: /usr/local/share/jaromail/zlibs/zuper.init
[D] Zuper 0.2 initialized
[D] 50 global variables registered
[D] 11 global arrays registered
[D] Loading zlib: /usr/local/share/jaromail/zlibs/helpers
[D] Loading zlib: /usr/local/share/jaromail/zlibs/accounts
[D] Loading zlib: /usr/local/share/jaromail/zlibs/zuper
[D] Loading zlib: /usr/local/share/jaromail/zlibs/search
[D] Loading zlib: /usr/local/share/jaromail/zlibs/locking
[D] Loading zlib: /usr/local/share/jaromail/zlibs/keyring
[D] Loading zlib: /usr/local/share/jaromail/zlibs/publish
[D] Loading zlib: /usr/local/share/jaromail/zlibs/maildirs
[D] Loading zlib: /usr/local/share/jaromail/zlibs/filters
[D] Loading zlib: /usr/local/share/jaromail/zlibs/email
[D] Loading zlib: /usr/local/share/jaromail/zlibs/stats
[D] Loading zlib: /usr/local/share/jaromail/zlibs/parse
[D] Loading zlib: /usr/local/share/jaromail/zlibs/addressbook
[D] Loading zlib: /usr/local/share/jaromail/zlibs/imap
. full set of auxiliary functions loaded
[D] Zuper 0.2 initialized
[D] 9 global variables registered
[D] 6 global arrays registered
[D] Rm binary: wipe -f -s -q -R /dev/urandom
[D] Mutt binary: /bin/mutt
[D] Notmuch binary: /bin/notmuch
[D] Alot binary: /bin/alot
[D] All debug messages ON
[D] fetch
[D] read_account looking for default
...
[D] trans: TLS1
[D] certfile:
[D] cert: check
[D] auth: plain
[D] options: keep
[D] folders:
[D] exclude: zz.spam zz.bounces zz.blacklist zz.social
[D] nm_setup
. notmuch setup unread
(*) Fetching email for account default
[D] Test if we are online
[D] trying to connect mail.riseup.net port 993
is_online:28: command not found: nc
[E] Host unreachable: mail.riseup.net
. Network connection is checked with 16s timeout
. if you want to bypass this check, use -f to force.
[E] Operation aborted.
[D] endgame EXIT
[D] destructor: _ztmp_destructor
[D] _ztmp_destructor

4.2 is released. Patch no longer needed it seems.
Updated pkgbuild below:
# Maintainer: parazyd <parazyd@dyne.org>
pkgname=jaromail
pkgver=4.2
pkgrel=1
pkgdesc="A commandline tool to easily and privately handle your e-mail"
arch=('x86_64' 'i686')
url="https://www.dyne.org/software/jaro-mail/"
license=('GPL3')
depends=('zsh' 'mutt' 'fetchmail' 'vim' 'msmtp' 'notmuch' 'abook' 'elinks' 'pinentry' 'wipe' 'alot')
makedepends=('gcc' 'glib2')
source=("https://files.dyne.org/$pkgname/$pkgname-$pkgver.tar.gz")
sha256sums=("7520b3b13b8b2fb2eaf3c1f4407e716722acd2b7b6ccdf4c170116e45201fd10")
# Jaromil https://jaromil.dyne.org/contact
validpgpkeys=('6113D89CA825C5CEDD02C87273B35DA54ACB7D10')


build() {
cd "$pkgname-$pkgver"
make
}

package() {

cd "$pkgname-$pkgver"

# local vars
prefix=$pkgdir/usr/local
jaro_libexec=$prefix/share/jaromail
jaro_share=$prefix/share/jaromail
#out of package vars
PREFIX=/usr/local
JARO_LIBEXEC=$PREFIX/share/jaromail
JARO_SHARE=$PREFIX/share/jaromail

mkdir -p "$jaro_share"
mkdir -p "$jaro_share/.mutt"
mkdir -p "$jaro_share/.stats"
cp -ra doc/* $jaro_share/.mutt/
cp -ra src/mutt/* $jaro_share/.mutt/
cp -ra src/stats/* $jaro_share/.stats/

mkdir -p $jaro_libexec/bin
mkdir -p $jaro_libexec/zlibs
cp src/jaro $jaro_libexec/bin/
cp -ra build/gnu/* $jaro_libexec/bin/
cp -r src/zlibs/* $jaro_libexec/zlibs/

for l in $(ls $jaro_libexec/zlibs/ | grep '.zwc$'); do
rm -f $l
done

for l in $(ls $jaro_libexec/zlibs/ | grep -v '.zwc$'); do
zsh -c "zcompile $jaro_libexec/zlibs/$l"
done

chmod -R a+rX "$jaro_share"

mkdir -p $prefix/bin
echo -e "#!/usr/bin/env zsh" > $prefix/bin/jaro
echo -e "export JAROWORKDIR=${JARO_SHARE}" >> $prefix/bin/jaro

zsh -c "zmodload zsh/pcre"

echo -e "export JAROMAILDIR=${HOME}/Mail" >> $prefix/bin/jaro
echo "${JARO_SHARE}/bin/jaro \${=@}" >> $prefix/bin/jaro

chmod +x $prefix/bin/jaro

printf "\n\n*********************IMPORTANT**********************\n\n"
printf "Jaro Mail installed in: $PREFIX\n"
printf "Executable path: $PREFIX/bin/jaro\n\n"
printf "To initialize your Mail dir use: jaro init\n"
printf "Default is /root/Mail\n"
printf "Change it via environment variable JAROMAILDIR\n"
printf "****************************************************\n\n"

}