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diff --git a/system/pcem/pcem.SlackBuild b/system/pcem/pcem.SlackBuild
new file mode 100644
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+++ b/system/pcem/pcem.SlackBuild
@@ -0,0 +1,160 @@
+#!/bin/bash
+
+# Slackware build script for pcem
+
+# Copyright 2022-2023 K. Eugene Carlson  Tsukuba, Japan
+# 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.
+
+cd $(dirname $0) ; CWD=$(pwd)
+
+PRGNAM=pcem
+VERSION=${VERSION:-b8ad941.20230304}
+SRCVERSION=${SRCVERSION:-b8ad9416bc1d3acd8b384a83b753ddf2282bd091}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+PKGTYPE=${PKGTYPE:-tgz}
+
+# Use ALSA=yes to output MIDI with ALSA.
+unset USE_ALSA
+[ ${ALSA:-no} = yes ] && USE_ALSA="-DUSE_ALSA=ON"
+
+# Use NETWORKING=no to disable networking.
+USE_NETWORKING="-DUSE_NETWORKING=ON"
+[ ${NETWORKING:-yes} = no ] && USE_NETWORKING="-DUSE_NETWORKING=OFF"
+
+# Use PCAP=no to disable PCAP networking. Has no effect unless networking is
+# turned on.
+unset NO_PCAP
+[ ${PCAP:-yes} = no ] && NO_PCAP="-DUSE_PCAP_NETWORKING=OFF"
+
+# Use PLUGINS=yes to build the plugin engine.
+unset USE_PLUGINS
+[ ${PLUGINS:-no} = yes ] && USE_PLUGINS="-DPLUGIN_ENGINE=ON"
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
+# the name of the created package would be, and then exit. This information
+# could be useful to other scripts.
+if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
+  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
+  exit 0
+fi
+
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O3 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O3 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  # -fPIC causes the dynamic recompiler to crash
+  SLKCFLAGS="-O3"
+  LIBDIRSUFFIX=64
+else
+  SLKCFLAGS="-O3"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$SRCVERSION
+unzip $CWD/$PRGNAM-$SRCVERSION.zip
+cd $PRGNAM-$SRCVERSION
+
+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 {} \;
+
+mkdir build
+cd build
+cmake -G "Ninja" \
+  -DwxWidgets_CONFIG_OPTIONS="--version=3.0" \
+  -DCMAKE_C_FLAGS_RELEASE="$SLKCFLAGS" \
+  -DCMAKE_CXX_FLAGS_RELEASE="$SLKCFLAGS" \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_INSTALL_PREFIX=/usr \
+  -DPCEM_LIB_DIR=/usr/lib$LIBDIRSUFFIX \
+  $USE_ALSA \
+  $USE_NETWORKING \
+  $NO_PCAP \
+  $USE_PLUGINS \
+  ..
+ninja
+DESTDIR=$PKG ninja install/strip
+cd ..
+
+# Use a wrapper script to create a symlink to the system roms collection
+# (available with pcem-roms on SBo).
+mv $PKG/usr/bin/pcem $PKG/usr/bin/PCem
+cat << EOF >> $PKG/usr/bin/pcem
+#!/bin/bash
+
+[ ! -d \$HOME/.pcem ] && mkdir \$HOME/.pcem
+[ ! -d \$HOME/.pcem/roms ] && ln -s /usr/share/pcem/roms \$HOME/.pcem/roms
+PCem
+EOF
+chmod 0755 $PKG/usr/bin/pcem
+
+mkdir -p $PKG/usr/man/man1
+mv $PKG/usr/share/man/man1/pcem.man/pcem.man.1 $PKG/usr/man/man1/pcem.1
+rm -r $PKG/usr/share/man
+find $PKG/usr/man -type f -exec gzip -9 {} \;
+for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+
+# The text files saying "roms go here" aren't really necessary.
+find $PKG/usr/share/pcem/roms -name roms.txt -delete
+rm -f $PKG/usr/share/pcem/configs/configs.txt
+# File included in error.
+rm -f $PKG/usr/share/pcem/roms/mda.rom
+
+# Make the plugins directory, if appropriate
+[ ${PLUGINS:-no} = yes ] && mkdir $PKG/usr/share/pcem/plugins
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a \
+  TESTED.md \
+  README.md \
+  $PKG/usr/doc/$PRGNAM-$VERSION
+cat COPYING > $PKG/usr/doc/$PRGNAM-$VERSION/LICENSE
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+cat $CWD/README > $PKG/usr/doc/$PRGNAM-$VERSION/README.sw
+
+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