diff --git a/ruby/rubygem-parallel/README b/ruby/rubygem-parallel/README
new file mode 100644
index 0000000000..50c931c1b3
--- /dev/null
+++ b/ruby/rubygem-parallel/README
@@ -0,0 +1 @@
+rubygem-parallel - Run any kind of code in parallel processes
diff --git a/ruby/rubygem-parallel/rubygem-parallel.SlackBuild b/ruby/rubygem-parallel/rubygem-parallel.SlackBuild
new file mode 100644
index 0000000000..58a2d1cd53
--- /dev/null
+++ b/ruby/rubygem-parallel/rubygem-parallel.SlackBuild
@@ -0,0 +1,116 @@
+#!/bin/sh
+
+# Slackware build script for rubygem-parallel
+
+# Copyright 2018 Andrew Clemons, Wellington New Zealand
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=rubygem-parallel
+VERSION=${VERSION:-1.12.1}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+SRCNAM=parallel
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+
+DESTDIR=$( ruby -r rbconfig -e '
+include RbConfig
+printf("%s/%s/gems/%s\n",
+	CONFIG["libdir"],
+	CONFIG["RUBY_INSTALL_NAME"],
+	CONFIG["ruby_version"]
+      )
+')
+
+gem specification $CWD/$SRCNAM-$VERSION.gem | \
+	ruby -r yaml -r rbconfig -e '
+c = RbConfig::CONFIG
+path = sprintf("%s/%s/gems/%s",
+        c["libdir"],
+        c["RUBY_INSTALL_NAME"],
+        c["ruby_version"])
+sys_gemspecs = Dir.glob(path + "/specifications/**/*.gemspec").map {|g| gs = Gem::Specification.load(g); gs.name }
+obj = Gem::Specification.from_yaml($stdin)
+obj.dependencies.each {|dep|
+        if not(dep.type == :runtime)
+                next
+        end
+        if not(sys_gemspecs.include?(dep.name))
+                $stderr.write("WARNING: #{dep.name} gem not found\n")
+                sleep 0.5
+        end
+
+}'
+
+gem install \
+	--local \
+	--no-update-sources \
+	--ignore-dependencies \
+	--backtrace \
+	--install-dir $PKG/$DESTDIR \
+	--bindir $PKG/usr/bin \
+	$CWD/$SRCNAM-$VERSION.gem
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+tar -x -O --file=$CWD/$SRCNAM-$VERSION.gem data.tar.gz \
+  | tar -xz -C $PKG/usr/doc/$PRGNAM-$VERSION --file=- \
+  MIT-LICENSE.txt
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
diff --git a/ruby/rubygem-parallel/rubygem-parallel.info b/ruby/rubygem-parallel/rubygem-parallel.info
new file mode 100644
index 0000000000..b881334501
--- /dev/null
+++ b/ruby/rubygem-parallel/rubygem-parallel.info
@@ -0,0 +1,10 @@
+PRGNAM="rubygem-parallel"
+VERSION="1.12.1"
+HOMEPAGE="https://github.com/grosser/parallel"
+DOWNLOAD="https://rubygems.org/downloads/parallel-1.12.1.gem"
+MD5SUM="8d88001e0783da8b4bb33999efd4214e"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="Andrew Clemons"
+EMAIL="andrew.clemons@gmail.com"
diff --git a/ruby/rubygem-parallel/slack-desc b/ruby/rubygem-parallel/slack-desc
new file mode 100644
index 0000000000..c1ab132cbc
--- /dev/null
+++ b/ruby/rubygem-parallel/slack-desc
@@ -0,0 +1,19 @@
+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+                |-----handy-ruler------------------------------------------------------|
+rubygem-parallel: rubygem-parallel (run any kind of code in parallel processes)
+rubygem-parallel:
+rubygem-parallel: parallel processing made simple and fast
+rubygem-parallel:
+rubygem-parallel: https://github.com/grosser/parallel
+rubygem-parallel:
+rubygem-parallel:
+rubygem-parallel:
+rubygem-parallel:
+rubygem-parallel:
+rubygem-parallel: