h2o.conf

listen:
  port: 8080
hosts:
  "*":
    paths:
      /nstatuz:
        status: ON
      /:
        mruby.handler: |
          redis = H2O::Redis.new(:host => '127.0.0.1', :port => 6379)
          Proc.new do |env|
            set = redis.set('::1', '8045')
            get = redis.get(env['REMOTE_ADDR'])
            # redis.disconnect
            [ 200, { "Content-Type" => "application/json" }, [ '{"zip": "', get.join, '"}\n'] ]
          end
    access-log: 
      path: /dev/stdout
      format: "%{ssl.session-reused}x\t%{connection-id}x\t%{ssl.cipher}x\t%{ssl.session_ticket}x%{ssl.session-ticket}x"

h2o.service

[Unit]
Description=H2O - the optimized HTTP/1, HTTP/2 server
After=network-online.target nss-lookup.target remote-fs.target

[Service]
Type=simple
PIDFile=/run/h2o.pid
ExecStart=/usr/bin/h2o --mode master --conf /etc/h2o.conf
ExecReload=/usr/bin/kill -HUP $MAINPID
ExecStop=/usr/bin/kill -TERM $MAINPID
SyslogLevel=notice
PrivateTmp=true
LimitNOFILE=infinity

[Install]
WantedBy=multi-user.target

mruby_config.rb

MRuby::Build.new do |conf|
  # load specific toolchain settings

  # Gets set by the VS command prompts.
  if ENV['MRUBY_TOOLCHAIN']
    toolchain ENV['MRUBY_TOOLCHAIN']
  elsif ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
    toolchain :visualcpp
  else
    toolchain :gcc
  end

  # enable_debug

  # use mrbgems
  Dir.glob("../mruby-*/mrbgem.rake") do |x|
    g = File.basename File.dirname x
    if g == 'mruby-onig-regexp'
      conf.gem "../deps/#{g}" do |c|
        c.bundle_onigmo
      end
    else
      conf.gem "../deps/#{g}"
    end
  end

#  conf.gem :github => 'matsumoto-r/mruby-vedis'
#  conf.gem :git => 'https://github.com/matsumoto-r/mruby-redis.git'
  conf.gem :github => 'mattn/mruby-json'
#  conf.gem :github => 'take-cheeze/mruby-leveldb'
  conf.gem :github => 'mattn/mruby-sqlite3'
  conf.gem :github => 'matsumoto-r/mruby-http2'
  conf.gem :github => 'udzura/mruby-etcd'
#  conf.gem :github => 'mattn/mruby-sqlite3'
#  conf.gem :github => 'iij/mruby-aws-s3'
#  conf.gem :github => 'mattn/mruby-uv'
#  conf.gem :github => 'mattn/mruby-http'
#  conf.gem :github => 'matsumoto-r/mruby-httprequest'
#  conf.gem :github => 'iij/mruby-digest'
#  conf.gem :github => 'iij/mruby-pack'
   conf.gem :github => 'Asmod4n/mruby-simplemsgpack'
#  conf.gem :github => 'matsumoto-r/mruby-simplehttp'
#  conf.gem :github => 'iij/mruby-socket'
#  conf.gem :git => 'https://github.com/luisbebop/mruby-polarssl.git'
  # include all the core GEMs
  conf.gembox 'full-core'
end

PKGBUILD

# Maintainer: Yannick Koechlin <yannick.koechlin@tamedia.ch>

pkgname=h2o-future
pkgver=r3959.4bc17f98
pkgrel=1
pkgdesc="Optimized HTTP server with support for HTTP/1.x and HTTP/2. git version with extra gems"
arch=('i686' 'x86_64')
depends=('libuv' 'libyaml' 'wslay' 'zlib' 'sqlite3' 'leveldb' 'hiredis' 'librdkafka-git' 'nghttp2' 'curl' 'mbedtls')
makedepends=('cmake' 'libtool' 'make' 'pkg-config' 'ruby')
url="https://github.com/h2o/h2o"
license=('MIT')
source=("$pkgname"::'git+https://github.com/tamediadigital/h2o.git#branch=distribution'
        h2o.service
	mruby_config.rb
)
sha256sums=('SKIP'
            '8a85462b6798deaaab343b5dae73437e251c5018d70d260a4a4440b9bbb053e6'
	    'SKIP'
)
backup=('etc/h2o.conf')
provides=('h2o' 'libh2o')
conflicts=('libh2o' 'h2o')

pkgver() {
	cd "$srcdir/${pkgname}"
	printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
}


build() {
  cd "$srcdir/$pkgname"
#  cp ../../mruby_config.rb misc/mruby_config.rb
#  rm -rf deps/mruby
#  git clone https://github.com/mruby/mruby deps/mruby
  git submodule update --init --recursive  
  msg2 'Building...'
  cmake \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_LIBDIR='/usr/lib' \
    -DCMAKE_SKIP_RPATH='TRUE' \
    -DWITH_BUNDLED_SSL=ON \
    -DWITH_RDKAFKA=on \
    -DEXTRA_LIBS="" \
    -DWITH_MRUBY=on \
  .
  make
  make libh2o
}

package() {
  cd "$srcdir/$pkgname"

  msg2 'Installing license...'
  install -Dm 644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"

  msg2 'Installing documentation...'
  install -Dm 644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"

  msg2 'Installing systemd service...'
  install -Dm 644 "$srcdir/h2o.service" "$pkgdir/usr/lib/systemd/system/h2o.service"

  msg2 'Installing conf file...'
  install -Dm 644 examples/h2o/h2o.conf "$pkgdir/etc/h2o.conf"

  msg2 'Installing...'
  make DESTDIR="$pkgdir" install
}

Thank YOU!! 👍
I've been trying for the last 4 hours to add mruby gems. I found h2o/h2o#993 but it doesn't work by dumping gems inside deps even with 'mruby-name' , by modifying misc/mruby_config.rb works like a charm.