diff --git a/academic/treerecs/README b/academic/treerecs/README
new file mode 100644
index 0000000000..283164480a
--- /dev/null
+++ b/academic/treerecs/README
@@ -0,0 +1,38 @@
+Treerecs: a tree reconciliation tool
+
+Treerecs is an open-source (species- and gene-) tree reconciliation
+software distributed under the GNU AGPL licence. It can correct,
+rearrange and (re-)root gene trees with regard to a given species tree.
+It was designed to be both efficient and easy to install and to use.
+
+Features
+- Correct gene trees with regard to a reference species tree
+- Root or re-root gene trees
+- Contract gene-tree branches whose support is lower than a given
+  threshold, thus creating polytomies (multifurcations) that can be
+  resolved therefater
+- Sample solutions with equivalent scores
+- Produce a graphical representation of the reconciled trees
+- Supported formats
+
+Treerecs supports the following formats: Newick, NHX, PhyloXML, 
+recPhyloXML, SVG (graphical output).
+
+A program that can drive Treerecs, providing a GUI is Seaview, also
+available at SBo. The SlacBuild script builds two additional programs:
+
+1) ALEevaluate_undated: an executable of the ALE (Amalgamated likelihood
+estimation, https://github.com/ssolo/ALE), by Szollosi GJ et al). This
+version has other mapping options and a different implementation in
+Bio++ use.
+
+2) genetreeEditor: a small program which provides editing of gene names 
+using species names and format conversion (Newick, Nhx or PhyloXML) . 
+
+For more information, see preprint at  bioRxiv:
+Treerecs: an integrated phylogenetic tool, from sequences to
+reconciliations. Nicolas Comte, Benoit Morel, Damir Hasic, Laurent
+Guéguen, Bastien Boussau, Vincent Daubin, Simon Penel, Celine
+Scornavacca, Manolo Gouy, Alexandros Stamatakis, Eric Tannier.
+View ORCID ProfileDavid P. Parsons
+https://www.biorxiv.org/content/10.1101/782946v1
diff --git a/academic/treerecs/doinst.sh b/academic/treerecs/doinst.sh
new file mode 100644
index 0000000000..5fb28930db
--- /dev/null
+++ b/academic/treerecs/doinst.sh
@@ -0,0 +1,3 @@
+if [ -x /usr/bin/update-desktop-database ]; then
+  /usr/bin/update-desktop-database -q usr/share/applications >/dev/null 2>&1
+fi
diff --git a/academic/treerecs/slack-desc b/academic/treerecs/slack-desc
new file mode 100644
index 0000000000..319b6b6f7b
--- /dev/null
+++ b/academic/treerecs/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------------------------------------------------------|
+treerecs: treerecs (Treerecs: a tree reconciliation tool)
+treerecs:
+treerecs: Treerecs is an open-source (species- and gene-) tree reconciliation
+treerecs: software. It can correct, rearrange and (re-)root gene trees with
+treerecs: regard to a given species tree.
+treerecs:
+treerecs: https://project.inria.fr/treerecs/
+treerecs: https://gitlab.inria.fr/Phylophile/Treerecs
+treerecs:
+treerecs:
+treerecs:
diff --git a/academic/treerecs/treerecs.SlackBuild b/academic/treerecs/treerecs.SlackBuild
new file mode 100644
index 0000000000..14e1cebfe0
--- /dev/null
+++ b/academic/treerecs/treerecs.SlackBuild
@@ -0,0 +1,123 @@
+#!/bin/bash
+
+# Slackware build script for treerecs
+
+# Copyright 2020-2023 Petar Petrov slackalaxy@gmail.com
+# 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.
+
+# Thanks to David Parsons for clarifications about the scipt and suggestions!
+
+cd $(dirname $0) ; CWD=$(pwd)
+
+PRGNAM=treerecs
+SRCNAM=Treerecs
+VERSION=${VERSION:-1.2}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+PKGTYPE=${PKGTYPE:-tgz}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+if [ ! -z "${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 [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$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 $SRCNAM-v${VERSION}
+tar xvf $CWD/$SRCNAM-v${VERSION}.tar.gz
+cd $SRCNAM-v${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 {} \;
+
+# GCC 12 explicitly requires these
+# https://stackoverflow.com/a/68149587
+sed -i "45i #include <limits>" ext/bpp/bpp-core/src/Bpp/Graph/GlobalGraph.cpp
+sed -i "26i #include <utility>" src/treerecs/containers/AbstractGrid.h
+
+mkdir -p build
+cd build
+  cmake \
+    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
+    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
+    -DCMAKE_BUILD_TYPE=Release ..
+  make
+cd ..
+
+# This is the program executable. Using "make install DESTDIR=$PKG"
+# works, but it simply puts treerecs in /usr/local/bin and that's it
+install -D -m755 build/bin/$PRGNAM $PKG/usr/bin/$PRGNAM
+
+# Include the extra binaries
+install -D -m755 build/bin/misc/ALEevaluate_undated $PKG/usr/bin/ALEevaluate_undated
+install -D -m755 build/bin/misc/genetreeEditor $PKG/usr/bin/genetreeEditor
+
+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
+
+# Copy some examples and the icon just in case
+mkdir -p $PKG/usr/share/$PRGNAM
+cp -a examples ${PRGNAM}_icon.png $PKG/usr/share/$PRGNAM
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a \
+  AUTHORS COPYING CONTRIBUTING.md README.md \
+  $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a build/bin/misc/README.md $PKG/usr/doc/$PRGNAM-$VERSION/README-misc.md
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+cat $CWD/doinst.sh > $PKG/install/doinst.sh
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE
diff --git a/academic/treerecs/treerecs.info b/academic/treerecs/treerecs.info
new file mode 100644
index 0000000000..f6a81aa05b
--- /dev/null
+++ b/academic/treerecs/treerecs.info
@@ -0,0 +1,10 @@
+PRGNAM="treerecs"
+VERSION="1.2"
+HOMEPAGE="https://project.inria.fr/treerecs/"
+DOWNLOAD="https://gitlab.inria.fr/Phylophile/Treerecs/-/archive/v1.2/Treerecs-v1.2.tar.gz"
+MD5SUM="a85d2dc0047278bfb0017c2b69824b56"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="Petar Petrov"
+EMAIL="slackalaxy@gmail.com"