diff --git a/development/obnc-libext/README b/development/obnc-libext/README
new file mode 100644
index 0000000000..d76b71bb75
--- /dev/null
+++ b/development/obnc-libext/README
@@ -0,0 +1,10 @@
+obnc-libext (Extended Library for OBNC)
+
+This package complements the basic libraries bundled with OBNC (the Oberon
+compiler obnc) with modules for accessing command line arguments and
+evironment variables, printing to the standard error stream and converting
+numbers to strings and viceversa.
+
+Be sure to update the compiler package (obnc) before updating this library
+package, as it usually needs the latest compiler features in order to
+compile.
diff --git a/development/obnc-libext/obnc-libext.SlackBuild b/development/obnc-libext/obnc-libext.SlackBuild
new file mode 100644
index 0000000000..281ab3d811
--- /dev/null
+++ b/development/obnc-libext/obnc-libext.SlackBuild
@@ -0,0 +1,91 @@
+#!/bin/sh
+
+# Slackware build script for obnc-libext
+
+# Copyright 2019 Jorge Giner Cordero
+# 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=obnc-libext
+VERSION=${VERSION:-0.6.0}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$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
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM\_$VERSION.tar.gz
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+CFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS" \
+./build
+
+./install --prefix=/usr --libdir=lib${LIBDIRSUFFIX} --destdir=$PKG
+
+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
+mv $PKG/usr/share/doc/obnc/* $PKG/usr/doc/$PRGNAM-$VERSION
+rm -rf $PKG/usr/share
+cp -a COPYING README $PKG/usr/doc/$PRGNAM-$VERSION
+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/development/obnc-libext/obnc-libext.info b/development/obnc-libext/obnc-libext.info
new file mode 100644
index 0000000000..8ecc8741e3
--- /dev/null
+++ b/development/obnc-libext/obnc-libext.info
@@ -0,0 +1,10 @@
+PRGNAM="obnc-libext"
+VERSION="0.6.0"
+HOMEPAGE="http://miasap.se/obnc"
+DOWNLOAD="http://miasap.se/obnc/downloads/obnc-libext_0.6.0.tar.gz"
+MD5SUM="47d4a5147aff8f06f353e28959c59932"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES="obnc"
+MAINTAINER="Jorge Giner"
+EMAIL="malferit@gmail.com"
diff --git a/development/obnc-libext/slack-desc b/development/obnc-libext/slack-desc
new file mode 100644
index 0000000000..9cb992ff56
--- /dev/null
+++ b/development/obnc-libext/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------------------------------------------------------|
+obnc-libext: obnc-libext (Extended Library for OBNC)
+obnc-libext:
+obnc-libext: This package complements the basic libraries bundled with OBNC (the
+obnc-libext: Oberon compiler obnc) with modules for accessing command line
+obnc-libext: arguments and evironment variables, printing to the standard error
+obnc-libext: stream and converting numbers to strings and viceversa.
+obnc-libext:
+obnc-libext: http://miasap.se/obnc
+obnc-libext:
+obnc-libext:
+obnc-libext: