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diff --git a/flatpak/build/flatpak.SlackBuild b/flatpak/build/flatpak.SlackBuild
new file mode 100755
index 00000000..79e37bde
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+++ b/flatpak/build/flatpak.SlackBuild
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+#!/bin/sh
+# $Id$
+# Copyright 2022  Eric Hameleers, Eindhoven, NL
+# All rights reserved.
+#
+#   Permission to use, copy, modify, and distribute this software for
+#   any purpose with or without fee is hereby granted, provided that
+#   the above copyright notice and this permission notice appear in all
+#   copies.
+#
+#   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
+#   CONTRIBUTORS 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.
+# -----------------------------------------------------------------------------
+#
+# Slackware SlackBuild script 
+# ===========================
+# By:          Eric Hameleers <alien@slackware.com>
+# For:         flatpak
+# Descr:       linux application sandboxing and distribution framework
+# URL:         https://flatpak.org/
+# Build needs: 
+# Needs:       appstream bubblewrap libostree xdg-desktop-portal-gtk
+# Changelog:   
+# 1.14.0-1:    15/oct/2022 by Eric Hameleers <alien@slackware.com>
+#              * Initial build.
+# 
+# Run 'sh flatpak.SlackBuild' to build a Slackware package.
+# The package (.t?z) and .txt file as well as build logs are created in /tmp .
+# Install the package using 'installpkg' or 'upgradepkg --install-new'.
+#
+# -----------------------------------------------------------------------------
+
+PRGNAM=flatpak
+VERSION=${VERSION:-1.14.0}
+BUILD=${BUILD:-1}
+NUMJOBS=${NUMJOBS:-" -j$(nproc) "}
+TAG=${TAG:-alien}
+
+DOCS="COPYING INSTALL NEWS README.md"
+
+# Flatpak system helper (as defined in https://slackbuilds.org/uid_gid.txt):
+FLAT_UID=372
+FLAT_GID=372
+
+# Where do we look for sources?
+SRCDIR=$(cd $(dirname $0); pwd)
+
+# Place to build (TMP) package (PKG) and output (OUTPUT) the program:
+TMP=${TMP:-/tmp/build}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+SOURCE[0]="$SRCDIR/${PRGNAM}-${VERSION}.tar.xz"
+SRCURL[0]="https://github.com/${PRGNAM}/${PRGNAM}/releases/download/${VERSION}/${PRGNAM}-${VERSION}.tar.xz"
+
+SOURCE[1]="$SRCDIR/flathub.flatpakrepo"
+SRCURL[1]="https://dl.flathub.org/repo/flathub.flatpakrepo"
+
+##
+## --- with a little luck, you won't have to edit below this point --- ##
+##
+
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$(uname -m)" in
+    i?86) ARCH=i586 ;;
+    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+    *) ARCH=$(uname -m) ;;
+  esac
+  export ARCH
+fi
+# Set CFLAGS/CXXFLAGS and LIBDIRSUFFIX:
+case "$ARCH" in
+  i?86)      SLKCFLAGS="-O2 -march=${ARCH} -mtune=i686"
+             SLKLDFLAGS=""; LIBDIRSUFFIX=""
+             ;;
+  x86_64)    SLKCFLAGS="-O2 -fPIC"
+             SLKLDFLAGS="-L/usr/lib64"; LIBDIRSUFFIX="64"
+             ;;
+  armv7hl)   SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
+             SLKLDFLAGS=""; LIBDIRSUFFIX=""
+             ;;
+  *)         SLKCFLAGS=${SLKCFLAGS:-"-O2"}
+             SLKLDFLAGS=${SLKLDFLAGS:-""}; LIBDIRSUFFIX=${LIBDIRSUFFIX:-""}
+             ;;
+esac
+
+case "$ARCH" in
+    arm*)    TARGET=$ARCH-slackware-linux-gnueabi ;;
+    *)       TARGET=$ARCH-slackware-linux ;;
+esac
+
+# Exit the script on errors:
+set -e
+trap 'echo "$0 FAILED at line ${LINENO}" | tee $OUTPUT/error-${PRGNAM}.log' ERR
+# Catch unitialized variables:
+set -u
+P1=${1:-1}
+
+# Save old umask and set to 0022:
+_UMASK_=$(umask)
+umask 0022
+
+# Create working directories:
+mkdir -p $OUTPUT          # place for the package to be saved
+mkdir -p $TMP/tmp-$PRGNAM # location to build the source
+mkdir -p $PKG             # place for the package to be built
+rm -rf $PKG/*             # always erase old package's contents
+rm -rf $TMP/tmp-$PRGNAM/* # remove the remnants of previous build
+rm -rf $OUTPUT/{checkout,configure,make,install,error,makepkg,patch}-$PRGNAM.log
+                          # remove old log files
+
+# Source file availability:
+for (( i = 0; i < ${#SOURCE[*]}; i++ )) ; do
+  if ! [ -f ${SOURCE[$i]} ]; then
+    echo "Source '$(basename ${SOURCE[$i]})' not available yet..."
+    # Check if the $SRCDIR is writable at all - if not, download to $OUTPUT
+    [ -w "$SRCDIR" ] || SOURCE[$i]="$OUTPUT/$(basename ${SOURCE[$i]})"
+    if [ -f ${SOURCE[$i]} ]; then echo "Ah, found it!"; continue; fi
+    if ! [ "x${SRCURL[$i]}" == "x" ]; then
+      echo "Will download file to $(dirname $SOURCE[$i])"
+      wget --no-check-certificate -nv -T 20 -O "${SOURCE[$i]}" "${SRCURL[$i]}" || true
+      if [ $? -ne 0 -o ! -s "${SOURCE[$i]}" ]; then
+        echo "Fail to download '$(basename ${SOURCE[$i]})'. Aborting the build."
+        mv -f "${SOURCE[$i]}" "${SOURCE[$i]}".FAIL
+        exit 1
+      fi
+    else
+      echo "File '$(basename ${SOURCE[$i]})' not available. Aborting the build."
+      exit 1
+    fi
+  fi
+done
+
+if [ "$P1" == "--download" ]; then
+  echo "Download complete."
+  exit 0
+fi
+
+# --- PACKAGE BUILDING ---
+
+echo "++"
+echo "|| $PRGNAM-$VERSION"
+echo "++"
+
+cd $TMP/tmp-$PRGNAM
+echo "Extracting the source archive(s) for $PRGNAM..."
+tar -xvf ${SOURCE[0]}
+cd ${PRGNAM}-${VERSION}
+chown -R root:root .
+chmod -R u+w,go+r-w,a+rX-st .
+
+echo Building ...
+LDFLAGS="$SLKLDFLAGS" \
+CXXFLAGS="$SLKCFLAGS" \
+CFLAGS="$SLKCFLAGS" \
+./configure \
+  --prefix=/usr \
+  --libdir=/usr/lib${LIBDIRSUFFIX} \
+  --mandir=/usr/man \
+  --docdir=/usr/doc/$PRGNAM-$VERSION \
+  --localstatedir=/var \
+  --sysconfdir=/etc \
+  --with-privileged-group=wheel \
+  --with-system-bubblewrap \
+  --with-system-helper-user=flatpak \
+  --disable-static \
+  --program-prefix= \
+  --program-suffix= \
+  --build=$TARGET \
+  2>&1 | tee $OUTPUT/configure-${PRGNAM}.log
+
+make $NUMJOBS 2>&1 | tee $OUTPUT/make-${PRGNAM}.log
+make DESTDIR=$PKG install 2>&1 | tee $OUTPUT/install-${PRGNAM}.log
+
+# Don't ship .la files:
+rm -f $PKG/{,usr/}lib${LIBDIRSUFFIX}/*.la
+
+# Flatpak would create this otherwise, and by creating it in the package,
+# removepkg can track the content changes:
+mkdir -p $PKG/var/lib/flatpak
+
+# Add flathub definition.
+# The doinst.sh will actually install it as a flatpak remote repository:
+install -D -m 0644 -t $PKG/etc/flatpak/remotes.d $SRCDIR/flathub.flatpakrepo
+
+# We want flatpak enabled out of the box:
+chmod 0755 $PKG/etc/profile.d/flatpak.sh
+
+# Preserve customized profile script:
+mv -i $PKG/etc/profile.d/flatpak.sh{,.new}
+
+# Add this to the doinst.sh:
+mkdir -p $PKG/install
+cat <<EOINS >> $PKG/install/doinst.sh
+# Handle the incoming configuration files:
+config() {
+  for infile in \$1; do
+    NEW="\$infile"
+    OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
+    # If there's no config file by that name, mv it over:
+    if [ ! -r \$OLD ]; then
+      mv \$NEW \$OLD
+    elif [ "\$(cat \$OLD | md5sum)" = "\$(cat \$NEW | md5sum)" ]; then
+      # toss the redundant copy
+      rm \$NEW
+    fi
+    # Otherwise, we leave the .new copy for the admin to consider...
+  done
+}
+
+preserve_perms() {
+  NEW="\$1"
+  OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
+  if [ -e \$OLD ]; then
+    cp -a \$OLD \${NEW}.incoming
+    cat \$NEW > \${NEW}.incoming
+    mv \${NEW}.incoming \$NEW
+  fi
+  config \$NEW
+}
+
+preserve_perms etc/profile.d/flatpak.sh.new
+
+# Only way to create and use the correct uid and gid on the target system,
+# is to use chroot:
+chroot . <<EOR 2>/dev/null
+# Add the '${FLAT_GID}' group if it doesn't exist already:
+/usr/sbin/groupadd -g ${FLAT_GID} flatpak 2> /dev/null
+
+# Add the '${FLAT_UID}' user if it doesn't exist already:
+/usr/sbin/useradd -c "Flatpak system helper" -d /var/lib/flatpak -M \\
+  -s "/bin/false" -g ${FLAT_GID} -u ${FLAT_UID} flatpak 2> /dev/null
+EOR
+
+# Make the flathub repository available to root:
+chroot . \
+  /usr/bin/flatpak remote-add --if-not-exists \
+  flathub /etc/flatpak/remotes.d/flathub.flatpakrepo
+# Inform the user about adding flatpak to their homedirectory:
+echo "NOTE:"
+echo ">> you can add the FlatHub repository for your own user if you do not want to use the 'root' account, by executing the following command:"
+echo ">> flatpak --user remote-add --if-not-exists flathub /etc/flatpak/remotes.d/flathub.flatpakrepo"
+echo ">> In general, add '--user' to any flatpak command to make it apply to your own personal environment."
+echo ""
+EOINS
+
+# Add documentation:
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION || true
+cat $SRCDIR/$(basename $0) > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION
+find $PKG/usr/doc -type f -exec chmod 644 {} \;
+
+# Compress the man page(s):
+if [ -d $PKG/usr/man ]; then
+  find $PKG/usr/man -type f -name "*.?" -exec gzip -9f {} \;
+  for i in $(find $PKG/usr/man -type l -name "*.?") ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+fi
+
+# Strip binaries (if any):
+find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+# Add a package description:
+mkdir -p $PKG/install
+cat $SRCDIR/slack-desc > $PKG/install/slack-desc
+cat $SRCDIR/slack-required > $PKG/install/slack-required
+
+# Build the package:
+cd $PKG
+makepkg --linkadd y --chown n $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} 2>&1 | tee $OUTPUT/makepkg-${PRGNAM}.log
+cd $OUTPUT
+md5sum ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} > ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz}.md5
+cd -
+cat $PKG/install/slack-desc | grep "^${PRGNAM}" > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.txt
+cat $PKG/install/slack-required > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.dep
+
+# Restore the original umask:
+umask ${_UMASK_}
+
diff --git a/flatpak/build/slack-desc b/flatpak/build/slack-desc
new file mode 100644
index 00000000..3295a599
--- /dev/null
+++ b/flatpak/build/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------------------------------------------------------|
+flatpak: flatpak (linux application sandboxing and distribution framework)
+flatpak:
+flatpak: Flatpak is a system for building, distributing, and running
+flatpak: sandboxed desktop applications on Linux.
+flatpak: Flatpak can be used by all kinds of desktop applications, and aims
+flatpak: to be as agnostic as possible regarding how applications are built.
+flatpak: While Flatpak only runs on Linux, it can be used by applications
+flatpak: that target other operating systems, as well as those that are
+flatpak: Linux-specific.
+flatpak:
+flatpak: See also: https://flatpak.org/
diff --git a/flatpak/build/slack-required b/flatpak/build/slack-required
new file mode 100644
index 00000000..004ce35a
--- /dev/null
+++ b/flatpak/build/slack-required
@@ -0,0 +1,5 @@
+appstream
+bubblewrap
+libostree
+xdg-desktop-portal-gtk
+