diff --git a/build/pkgs/sagemath_coxeter3/SPKG.rst b/build/pkgs/sagemath_coxeter3/SPKG.rst
new file mode 120000
index 00000000000..b4545b4bda6
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/SPKG.rst
@@ -0,0 +1 @@
+src/README.rst
\ No newline at end of file
diff --git a/build/pkgs/sagemath_coxeter3/bootstrap b/build/pkgs/sagemath_coxeter3/bootstrap
new file mode 120000
index 00000000000..40542346a4e
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/bootstrap
@@ -0,0 +1 @@
+../sagelib/bootstrap
\ No newline at end of file
diff --git a/build/pkgs/sagemath_coxeter3/dependencies b/build/pkgs/sagemath_coxeter3/dependencies
new file mode 100644
index 00000000000..55f26dde8e1
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/dependencies
@@ -0,0 +1 @@
+$(PYTHON) sagelib coxeter3 | $(PYTHON_TOOLCHAIN) sage_setup cython pkgconfig
diff --git a/build/pkgs/sagemath_coxeter3/distros/conda.txt b/build/pkgs/sagemath_coxeter3/distros/conda.txt
new file mode 100644
index 00000000000..3ffe2eb8bfc
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/distros/conda.txt
@@ -0,0 +1 @@
+sagemath-coxeter3
diff --git a/build/pkgs/sagemath_coxeter3/install-requires.txt b/build/pkgs/sagemath_coxeter3/install-requires.txt
new file mode 100644
index 00000000000..52e4f34c240
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/install-requires.txt
@@ -0,0 +1,2 @@
+# This file is updated on every release by the sage-update-version script
+sagemath-coxeter3
diff --git a/build/pkgs/sagemath_coxeter3/package-version.txt b/build/pkgs/sagemath_coxeter3/package-version.txt
new file mode 120000
index 00000000000..c4540217bba
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/package-version.txt
@@ -0,0 +1 @@
+src/VERSION.txt
\ No newline at end of file
diff --git a/build/pkgs/sagemath_coxeter3/spkg-install b/build/pkgs/sagemath_coxeter3/spkg-install
new file mode 100755
index 00000000000..7ce202f09ae
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/spkg-install
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# From sage-spkg.
+# For type=script packages, the build rule in build/make/Makefile sources
+# sage-env but not sage-dist-helpers.
+lib="$SAGE_ROOT/build/bin/sage-dist-helpers"
+source "$lib"
+if [ $? -ne 0 ]; then
+    echo >&2 "Error: failed to source $lib"
+    echo >&2 "Is $SAGE_ROOT the correct SAGE_ROOT?"
+    exit 1
+fi
+cd src
+
+export PIP_NO_INDEX=true
+export PIP_FIND_LINKS="file://$SAGE_SPKG_WHEELS"
+
+if [ "$SAGE_EDITABLE" = yes ]; then
+    # SAGE_ROOT/src/setup.py installs everything, nothing to do...
+    if [ "$SAGE_WHEELS" = yes ]; then
+        # ... except we build the wheel if requested
+        sdh_setup_bdist_wheel && sdh_store_wheel .
+    fi
+else
+    if [ "$SAGE_WHEELS" = yes ]; then
+        # Modularized install via wheels
+        sdh_pip_install .
+    # else nothing to do in legacy direct installation.
+    fi
+fi
diff --git a/build/pkgs/sagemath_coxeter3/spkg-src b/build/pkgs/sagemath_coxeter3/spkg-src
new file mode 100755
index 00000000000..8ae44f00fec
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/spkg-src
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+#
+# Script to prepare an sdist tarball for sagemath-coxeter3
+# This script is not used during build.
+#
+# HOW TO MAKE THE TARBALL:
+# ./sage --sh build/pkgs/sagemath_coxeter3/spkg-src
+
+if [ -z "$SAGE_ROOT" ] ; then
+    echo >&2 "Error - SAGE_ROOT undefined ... exiting"
+    echo >&2 "Maybe run 'sage -sh'?"
+    exit 1
+fi
+
+# Exit on failure
+set -e
+
+cd build/pkgs/sagemath_coxeter3
+
+cd src
+python3 -u setup.py --no-user-cfg sdist --dist-dir "$SAGE_DISTFILES"
diff --git a/build/pkgs/sagemath_coxeter3/src b/build/pkgs/sagemath_coxeter3/src
new file mode 120000
index 00000000000..a9a1c8ae443
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/src
@@ -0,0 +1 @@
+../../../pkgs/sagemath-coxeter3
\ No newline at end of file
diff --git a/build/pkgs/sagemath_coxeter3/type b/build/pkgs/sagemath_coxeter3/type
new file mode 100644
index 00000000000..134d9bc32d5
--- /dev/null
+++ b/build/pkgs/sagemath_coxeter3/type
@@ -0,0 +1 @@
+optional
diff --git a/pkgs/sagemath-coxeter3/MANIFEST.in b/pkgs/sagemath-coxeter3/MANIFEST.in
new file mode 100644
index 00000000000..8534471f1f2
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/MANIFEST.in
@@ -0,0 +1,11 @@
+global-exclude *.c
+global-exclude *.cpp
+
+global-exclude __pycache__
+global-exclude *.py[co]
+global-exclude *.bak
+global-exclude *.so
+global-exclude *~
+prune .tox
+prune build
+prune dist
diff --git a/pkgs/sagemath-coxeter3/README.rst b/pkgs/sagemath-coxeter3/README.rst
new file mode 100644
index 00000000000..fbc6e64938a
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/README.rst
@@ -0,0 +1,32 @@
+==============================================================================
+ Sage: Open Source Mathematics Software: Graph (iso/auto)morphisms with coxeter3
+==============================================================================
+
+About SageMath
+--------------
+
+   "Creating a Viable Open Source Alternative to
+    Magma, Maple, Mathematica, and MATLAB"
+
+   Copyright (C) 2005-2022 The Sage Development Team
+
+   https://www.sagemath.org
+
+SageMath fully supports all major Linux distributions, recent versions of
+macOS, and Windows (using Cygwin or Windows Subsystem for Linux).
+
+The traditional and recommended way to install SageMath is from source via
+Sage-the-distribution (https://www.sagemath.org/download-source.html).
+Sage-the-distribution first builds a large number of open source packages from
+source (unless it finds suitable versions installed in the system) and then
+installs the Sage Library (sagelib, implemented in Python and Cython).
+
+
+About this pip-installable source distribution
+----------------------------------------------
+
+This pip-installable source distribution ``sagemath-coxeter3`` is a small
+optional distribution for use with ``sagemath-standard``.
+
+It provides a Cython interface to the ``coxeter3`` library for the purpose
+of computing graph (iso/auto)morphisms.
diff --git a/pkgs/sagemath-coxeter3/VERSION.txt b/pkgs/sagemath-coxeter3/VERSION.txt
new file mode 100644
index 00000000000..737bfe2c1d2
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/VERSION.txt
@@ -0,0 +1 @@
+9.8.beta1
diff --git a/pkgs/sagemath-coxeter3/pyproject.toml.m4 b/pkgs/sagemath-coxeter3/pyproject.toml.m4
new file mode 100644
index 00000000000..aa4c23992be
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/pyproject.toml.m4
@@ -0,0 +1,14 @@
+[build-system]
+# Minimum requirements for the build system to execute.
+requires = [
+    esyscmd(`sage-get-system-packages install-requires-toml \
+        setuptools     \
+        wheel          \
+        sage_setup     \
+        sagemath_environment \
+        sagemath_standard \
+        cython         \
+        gmpy2          \
+        cysignals      \
+                    ')]
+build-backend = "setuptools.build_meta"
diff --git a/pkgs/sagemath-coxeter3/requirements.txt.m4 b/pkgs/sagemath-coxeter3/requirements.txt.m4
new file mode 100644
index 00000000000..8b6ca03b0b9
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/requirements.txt.m4
@@ -0,0 +1,2 @@
+Cython==esyscmd(`printf $(sed "s/[.]p.*//;" ../cython/package-version.txt)')
+sagemath-standard==esyscmd(`printf $(sed "s/[.]p.*//;" ../sagelib/package-version.txt)')
diff --git a/pkgs/sagemath-coxeter3/sage b/pkgs/sagemath-coxeter3/sage
new file mode 120000
index 00000000000..e0da5daa6f2
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/sage
@@ -0,0 +1 @@
+../../src/sage
\ No newline at end of file
diff --git a/pkgs/sagemath-coxeter3/setup.cfg.m4 b/pkgs/sagemath-coxeter3/setup.cfg.m4
new file mode 100644
index 00000000000..aad6b620681
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/setup.cfg.m4
@@ -0,0 +1,33 @@
+# -*- conf-unix -*-
+[metadata]
+name = sagemath-coxeter3
+version = file: VERSION.txt
+description = Sage: Open Source Mathematics Software: Graph (iso/auto)morphisms with coxeter3
+long_description = file: README.rst
+long_description_content_type = text/x-rst
+license = GNU General Public License (GPL) v2 or later
+author = The Sage Developers
+author_email = sage-support@googlegroups.com
+url = https://www.sagemath.org
+
+classifiers =
+    Development Status :: 6 - Mature
+    Intended Audience :: Education
+    Intended Audience :: Science/Research
+    License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)
+    Operating System :: POSIX
+    Operating System :: MacOS :: MacOS X
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: Implementation :: CPython
+    Topic :: Scientific/Engineering :: Mathematics
+
+[options]
+python_requires = >=3.8, <3.12
+install_requires =
+    esyscmd(`sage-get-system-packages install-requires \
+        sagelib \
+        | sed "2,\$s/^/    /;"')dnl
diff --git a/pkgs/sagemath-coxeter3/setup.py b/pkgs/sagemath-coxeter3/setup.py
new file mode 100644
index 00000000000..639b1124e8a
--- /dev/null
+++ b/pkgs/sagemath-coxeter3/setup.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+
+from distutils import log
+from setuptools import setup
+
+# Work around a Cython problem in Python 3.8.x on macOS
+# https://github.com/cython/cython/issues/3262
+import os
+if os.uname().sysname == 'Darwin':
+    import multiprocessing
+    multiprocessing.set_start_method('fork', force=True)
+
+# If build isolation is not in use and setuptools_scm is installed,
+# then its file_finders entry point is invoked, which we don't need.
+# Workaround from ​https://github.com/pypa/setuptools_scm/issues/190#issuecomment-351181286
+try:
+    import setuptools_scm.integration
+    setuptools_scm.integration.find_files = lambda _: []
+except ImportError:
+    pass
+
+# PEP 517 builds do not have . in sys.path
+import sys
+sys.path.insert(0, os.path.dirname(__file__))
+
+if len(sys.argv) > 1 and (sys.argv[1] == "sdist" or sys.argv[1] == "egg_info"):
+    sdist = True
+else:
+    sdist = False
+
+if sdist:
+    cmdclass = {}
+else:
+    from sage_setup.excepthook import excepthook
+    sys.excepthook = excepthook
+
+    from sage_setup.setenv import setenv
+    setenv()
+
+    import sage.env
+    sage.env.default_required_modules = sage.env.default_optional_modules = ()
+
+    from sage_setup.command.sage_build_cython import sage_build_cython
+    from sage_setup.command.sage_build_ext import sage_build_ext
+    sage_build_cython.built_distributions = ['sagemath-coxeter3']
+
+    cmdclass = dict(build_cython=sage_build_cython,
+                    build_ext=sage_build_ext)
+
+if sdist:
+    python_packages = []
+    python_modules = []
+    cython_modules = []
+else:
+    from sage_setup.find import find_python_sources
+    python_packages, python_modules, cython_modules = find_python_sources(
+        '.', ['sage'], distributions=['sagemath-coxeter3'])
+
+    log.warn('python_packages = {0}'.format(python_packages))
+    log.warn('python_modules = {0}'.format(python_modules))
+    log.warn('cython_modules = {0}'.format(cython_modules))
+
+setup(
+    cmdclass = cmdclass,
+    packages = python_packages,
+    py_modules  = python_modules,
+    ext_modules = cython_modules,
+)