diff --git a/.github/workflows/ci-linux-incremental.yml b/.github/workflows/ci-linux-incremental.yml
index 82b14472c55..4861ef1d1d0 100644
--- a/.github/workflows/ci-linux-incremental.yml
+++ b/.github/workflows/ci-linux-incremental.yml
@@ -19,7 +19,12 @@ on:
   pull_request:
     paths:
       - 'build/pkgs/**'
-      - 'pkgs/**'
+      - '!build/pkgs/sage_conf/**'
+      - '!build/pkgs/sage_docbuild/**'
+      - '!build/pkgs/sage_setup/**'
+      - '!build/pkgs/sage_sws2rst/**'
+      - '!build/pkgs/sagelib/**'
+      - '!build/pkgs/sagemath_*/**'
   workflow_dispatch:
 
 concurrency:
diff --git a/build/pkgs/sagemath_objects/spkg-check b/build/pkgs/sagemath_objects/spkg-check
index 87cea0fc38f..99a8528e0da 100755
--- a/build/pkgs/sagemath_objects/spkg-check
+++ b/build/pkgs/sagemath_objects/spkg-check
@@ -1,15 +1,45 @@
 #!/usr/bin/env bash
 cd src
 
+if [ ! -r tox.ini ]; then
+    echo "Not testing the package because there is no tox.ini"
+    exit 0
+fi
+
+for lib in "$SAGE_SRC/bin/sage-src-env-config" "$SAGE_SRC/bin/sage-env-config" "$SAGE_SRC/bin/sage-env" "$SAGE_ROOT/build/bin/sage-build-env-config" "$SAGE_ROOT/build/bin/sage-build-env"; do
+    source "$lib"
+    if [ $? -ne 0 ]; then
+        echo >&2 "Error: failed to source $lib"
+        echo >&2 "Is $SAGE_ROOT the correct SAGE_ROOT?"
+        exit 1
+    fi
+done
+
 export PIP_NO_INDEX=true
 export PIP_FIND_LINKS="file://$SAGE_SPKG_WHEELS"
 
-export TOX_PARALLEL_NO_SPINNER=1
+unset tox_args
+
 wheel="$(sed -n '1s,.*@ file://,,p' $SAGE_SPKG_SCRIPTS/$PKG_BASE/spkg-requirements.txt)"
-echo Running "tox -r -p auto -v --installpkg $wheel"
-tox -r -p auto -v --installpkg "$wheel"
+if [ -n "$wheel" ]; then
+    tox_envs=$(tox -l)
+    tox_args="-r -p auto -v --installpkg $wheel"
+elif [ "$SAGE_EDITABLE" = yes ]; then
+    tox_envs=$(tox -l | sed s/norequirements/editable/)
+    # FIXME: Should use -r if sage_setup or another build requirement changes
+    tox_args="-r -v -v -v -v -e $(echo $tox_envs | sed 's/ /,/g')"
+else
+    echo "Not testing the package because SAGE_WHEELS=$SAGE_WHEELS and SAGE_EDITABLE=$SAGE_EDITABLE"
+    exit 0
+fi
+
+export TOX_PARALLEL_NO_SPINNER=1
+
+echo Running "tox $tox_args"
+tox $tox_args
 status=$?
 case $status:$SAGE_CHECK:$([ -r known-test-failures.json ]; echo $?) in
+    0:no:*)   echo "Not testing the package because SAGE_CHECK=no";;
     0:*:0)    echo "Passed the test suite (modulo baseline known-test-failures*.json)";;
     0:*:*)    echo "Passed the test suite";;
     *:warn:0) echo "Warning: New failures (not in baseline known-test-failures*.json (ignored)"; status=0;;
@@ -18,10 +48,12 @@ case $status:$SAGE_CHECK:$([ -r known-test-failures.json ]; echo $?) in
     *:yes:*)  echo "Failures testing the package";;
 esac
 # Show summaries of failures (suppress lines ending with '[failed in baseline]')
-for f in $(pwd)/.tox/sagepython-sagewheels-nopypi-norequirements*/log/*-command*.log; do
-    if [ -r "$f" ]; then
-        echo "$f"
-        grep '^sage -t.*#[^]]*$' "$f"
-    fi
+for e in $tox_envs; do
+    for f in $(pwd)/.tox/$e/log/*-command*.log; do
+        if [ -r "$f" ]; then
+            echo "$f"
+            grep '^sage -t.*#[^]]*$' "$f"
+        fi
+    done
 done
 exit $status
diff --git a/pkgs/sage-conf_pypi/tox.ini b/pkgs/sage-conf_pypi/tox.ini
index fadf9a9cc6c..7160d4db678 100644
--- a/pkgs/sage-conf_pypi/tox.ini
+++ b/pkgs/sage-conf_pypi/tox.ini
@@ -1,6 +1,10 @@
 [tox]
 envlist = py39, py310, py311, py39-user, py310-user, py311-user
 
+requires =
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
+    tox<4.14.1
+
 [testenv:.pkg]
 basepython = py311
 passenv =
diff --git a/pkgs/sage-docbuild/tox.ini b/pkgs/sage-docbuild/tox.ini
index 77da5a78ede..efa222028ff 100644
--- a/pkgs/sage-docbuild/tox.ini
+++ b/pkgs/sage-docbuild/tox.ini
@@ -8,6 +8,10 @@
 #
 [tox]
 
+requires =
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
+    tox<4.14.1
+
 [testenv]
 deps = -rrequirements.txt
 
diff --git a/pkgs/sage-setup/tox.ini b/pkgs/sage-setup/tox.ini
index fd935f2e978..e8a22f03101 100644
--- a/pkgs/sage-setup/tox.ini
+++ b/pkgs/sage-setup/tox.ini
@@ -12,6 +12,10 @@
 #
 [tox]
 
+requires =
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
+    tox<4.14.1
+
 [testenv]
 deps = -rrequirements.txt
 
diff --git a/pkgs/sagemath-categories/known-test-failures.json b/pkgs/sagemath-categories/known-test-failures.json
index ddae185a7d9..ab27f65ca8d 100644
--- a/pkgs/sagemath-categories/known-test-failures.json
+++ b/pkgs/sagemath-categories/known-test-failures.json
@@ -26,7 +26,7 @@
         "ntests": 28
     },
     "sage.categories.affine_weyl_groups": {
-        "ntests": 14
+        "ntests": 15
     },
     "sage.categories.algebra_ideals": {
         "failed": true,
@@ -38,7 +38,7 @@
     },
     "sage.categories.algebras": {
         "failed": true,
-        "ntests": 20
+        "ntests": 25
     },
     "sage.categories.algebras_with_basis": {
         "failed": true,
@@ -126,7 +126,7 @@
     },
     "sage.categories.commutative_rings": {
         "failed": true,
-        "ntests": 39
+        "ntests": 41
     },
     "sage.categories.complete_discrete_valuation": {
         "failed": true,
@@ -148,15 +148,19 @@
     },
     "sage.categories.coxeter_groups": {
         "failed": true,
-        "ntests": 362
+        "ntests": 392
     },
     "sage.categories.cw_complexes": {
         "failed": true,
         "ntests": 36
     },
+    "sage.categories.dedekind_domains": {
+        "failed": true,
+        "ntests": 30
+    },
     "sage.categories.discrete_valuation": {
         "failed": true,
-        "ntests": 23
+        "ntests": 28
     },
     "sage.categories.distributive_magmas_and_additive_magmas": {
         "failed": true,
@@ -169,9 +173,6 @@
         "failed": true,
         "ntests": 7
     },
-    "sage.categories.drinfeld_modules": {
-        "ntests": 2
-    },
     "sage.categories.dual": {
         "failed": true,
         "ntests": 1
@@ -297,18 +298,18 @@
     },
     "sage.categories.filtered_modules_with_basis": {
         "failed": true,
-        "ntests": 65
+        "ntests": 74
     },
     "sage.categories.finite_complex_reflection_groups": {
         "failed": true,
-        "ntests": 178
+        "ntests": 189
     },
     "sage.categories.finite_coxeter_groups": {
         "ntests": 6
     },
     "sage.categories.finite_dimensional_algebras_with_basis": {
         "failed": true,
-        "ntests": 87
+        "ntests": 91
     },
     "sage.categories.finite_dimensional_bialgebras_with_basis": {
         "failed": true,
@@ -328,11 +329,11 @@
     },
     "sage.categories.finite_dimensional_lie_algebras_with_basis": {
         "failed": true,
-        "ntests": 34
+        "ntests": 73
     },
     "sage.categories.finite_dimensional_modules_with_basis": {
         "failed": true,
-        "ntests": 55
+        "ntests": 89
     },
     "sage.categories.finite_dimensional_nilpotent_lie_algebras_with_basis": {
         "failed": true,
@@ -493,10 +494,6 @@
         "failed": true,
         "ntests": 13
     },
-    "sage.categories.inner_product_spaces": {
-        "failed": true,
-        "ntests": 9
-    },
     "sage.categories.integral_domains": {
         "failed": true,
         "ntests": 22
@@ -530,7 +527,7 @@
     },
     "sage.categories.lie_algebras": {
         "failed": true,
-        "ntests": 125
+        "ntests": 135
     },
     "sage.categories.lie_algebras_with_basis": {
         "ntests": 19
@@ -586,7 +583,7 @@
     },
     "sage.categories.modules_with_basis": {
         "failed": true,
-        "ntests": 221
+        "ntests": 240
     },
     "sage.categories.monoid_algebras": {
         "failed": true,
@@ -598,7 +595,7 @@
     },
     "sage.categories.morphism": {
         "failed": true,
-        "ntests": 99
+        "ntests": 126
     },
     "sage.categories.number_fields": {
         "failed": true,
@@ -668,14 +665,14 @@
     },
     "sage.categories.rings": {
         "failed": true,
-        "ntests": 141
+        "ntests": 146
     },
     "sage.categories.rngs": {
         "ntests": 6
     },
     "sage.categories.schemes": {
         "failed": true,
-        "ntests": 23
+        "ntests": 41
     },
     "sage.categories.semigroups": {
         "failed": true,
@@ -711,7 +708,7 @@
     },
     "sage.categories.simplicial_sets": {
         "failed": true,
-        "ntests": 57
+        "ntests": 98
     },
     "sage.categories.subobjects": {
         "ntests": 2
@@ -765,7 +762,7 @@
     },
     "sage.categories.unital_algebras": {
         "failed": true,
-        "ntests": 39
+        "ntests": 37
     },
     "sage.categories.vector_spaces": {
         "failed": true,
@@ -783,7 +780,7 @@
     },
     "sage.cpython.debug": {
         "failed": true,
-        "ntests": 14
+        "ntests": 13
     },
     "sage.cpython.dict_del_by_value": {
         "failed": true,
@@ -808,30 +805,28 @@
     },
     "sage.doctest.control": {
         "failed": true,
-        "ntests": 0
+        "ntests": 230
     },
     "sage.doctest.external": {
         "ntests": 42
     },
     "sage.doctest.fixtures": {
-        "failed": true,
         "ntests": 59
     },
     "sage.doctest.forker": {
         "failed": true,
-        "ntests": 433
+        "ntests": 413
     },
     "sage.doctest.parsing": {
         "failed": true,
-        "ntests": 321
+        "ntests": 313
     },
     "sage.doctest.reporting": {
-        "failed": true,
-        "ntests": 124
+        "ntests": 115
     },
     "sage.doctest.sources": {
         "failed": true,
-        "ntests": 378
+        "ntests": 343
     },
     "sage.doctest.test": {
         "failed": true,
@@ -846,7 +841,7 @@
         "ntests": 41
     },
     "sage.features": {
-        "ntests": 145
+        "ntests": 143
     },
     "sage.features.all": {
         "ntests": 14
@@ -865,17 +860,23 @@
     },
     "sage.features.databases": {
         "failed": true,
-        "ntests": 26
+        "ntests": 38
     },
     "sage.features.dvipng": {
         "ntests": 4
     },
+    "sage.features.ecm": {
+        "ntests": 4
+    },
     "sage.features.ffmpeg": {
         "ntests": 4
     },
     "sage.features.four_ti_2": {
         "ntests": 6
     },
+    "sage.features.fricas": {
+        "ntests": 6
+    },
     "sage.features.gap": {
         "ntests": 6
     },
@@ -901,7 +902,11 @@
     "sage.features.internet": {
         "ntests": 5
     },
+    "sage.features.jmol": {
+        "ntests": 4
+    },
     "sage.features.join_feature": {
+        "failed": true,
         "ntests": 25
     },
     "sage.features.kenzo": {
@@ -960,7 +965,7 @@
     },
     "sage.features.sagemath": {
         "failed": true,
-        "ntests": 147
+        "ntests": 151
     },
     "sage.features.singular": {
         "ntests": 4
@@ -968,9 +973,16 @@
     "sage.features.sphinx": {
         "ntests": 4
     },
+    "sage.features.symengine_py": {
+        "ntests": 4
+    },
     "sage.features.tdlib": {
         "ntests": 2
     },
+    "sage.features.threejs": {
+        "failed": true,
+        "ntests": 6
+    },
     "sage.misc.abstract_method": {
         "failed": true,
         "ntests": 33
@@ -1001,7 +1013,7 @@
     },
     "sage.misc.decorators": {
         "failed": true,
-        "ntests": 126
+        "ntests": 125
     },
     "sage.misc.fast_methods": {
         "failed": true,
@@ -1059,7 +1071,7 @@
     },
     "sage.misc.package_dir": {
         "failed": true,
-        "ntests": 29
+        "ntests": 35
     },
     "sage.misc.persist": {
         "failed": true,
@@ -1091,7 +1103,7 @@
     },
     "sage.misc.sageinspect": {
         "failed": true,
-        "ntests": 329
+        "ntests": 322
     },
     "sage.misc.superseded": {
         "failed": true,
@@ -1157,7 +1169,7 @@
     },
     "sage.repl.interpreter": {
         "failed": true,
-        "ntests": 118
+        "ntests": 114
     },
     "sage.repl.ipython_extension": {
         "failed": true,
@@ -1165,13 +1177,14 @@
     },
     "sage.repl.ipython_kernel.install": {
         "failed": true,
-        "ntests": 40
+        "ntests": 35
     },
     "sage.repl.ipython_kernel.interact": {
         "failed": true,
         "ntests": 42
     },
     "sage.repl.ipython_kernel.kernel": {
+        "failed": true,
         "ntests": 12
     },
     "sage.repl.ipython_kernel.widgets": {
@@ -1188,7 +1201,7 @@
     },
     "sage.repl.load": {
         "failed": true,
-        "ntests": 42
+        "ntests": 38
     },
     "sage.repl.preparse": {
         "failed": true,
@@ -1206,7 +1219,7 @@
     },
     "sage.repl.rich_output.backend_ipython": {
         "failed": true,
-        "ntests": 78
+        "ntests": 75
     },
     "sage.repl.rich_output.buffer": {
         "failed": true,
@@ -1214,7 +1227,7 @@
     },
     "sage.repl.rich_output.display_manager": {
         "failed": true,
-        "ntests": 88
+        "ntests": 86
     },
     "sage.repl.rich_output.output_basic": {
         "ntests": 47
@@ -1251,7 +1264,7 @@
     },
     "sage.rings.ring": {
         "failed": true,
-        "ntests": 337
+        "ntests": 298
     },
     "sage.sets.pythonclass": {
         "failed": true,
@@ -1263,7 +1276,7 @@
     },
     "sage.structure.coerce": {
         "failed": true,
-        "ntests": 314
+        "ntests": 310
     },
     "sage.structure.coerce_actions": {
         "failed": true,
@@ -1298,7 +1311,7 @@
     },
     "sage.structure.factorization": {
         "failed": true,
-        "ntests": 203
+        "ntests": 200
     },
     "sage.structure.factorization_integer": {
         "failed": true,
@@ -1315,9 +1328,6 @@
     "sage.structure.global_options": {
         "ntests": 145
     },
-    "sage.structure.graphics_file": {
-        "ntests": 8
-    },
     "sage.structure.indexed_generators": {
         "failed": true,
         "ntests": 90
@@ -1345,7 +1355,7 @@
     },
     "sage.structure.parent": {
         "failed": true,
-        "ntests": 300
+        "ntests": 303
     },
     "sage.structure.parent_gens": {
         "failed": true,
diff --git a/pkgs/sagemath-categories/requirements-editable.txt.m4 b/pkgs/sagemath-categories/requirements-editable.txt.m4
new file mode 100644
index 00000000000..1c0abbe40ae
--- /dev/null
+++ b/pkgs/sagemath-categories/requirements-editable.txt.m4
@@ -0,0 +1,7 @@
+include(`sage_spkg_versions.m4')dnl
+dnl Same as setup.cfg.m4 install_requires; FIXME: should pin to built wheels.
+SPKG_INSTALL_REQUIRES_gmpy2
+SPKG_INSTALL_REQUIRES_cysignals
+SPKG_INSTALL_REQUIRES_memory_allocator
+-e ../sagemath-environment
+-e ../sagemath-objects
diff --git a/pkgs/sagemath-categories/tox.ini b/pkgs/sagemath-categories/tox.ini
index b4bb49d132a..841209e88f1 100644
--- a/pkgs/sagemath-categories/tox.ini
+++ b/pkgs/sagemath-categories/tox.ini
@@ -13,7 +13,9 @@ envlist =
 requires =
     # Auto-provision a modern tox.
     # [pkgenv] added in 4.2 - https://tox.wiki/en/latest/upgrading.html#packaging-configuration-and-inheritance
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2
+    tox<4.14.1
 
 [pkgenv]
 # Environment in which to build the sdist.
@@ -49,6 +51,11 @@ passenv =                    {[pkgenv]passenv}
 setenv =                     {[pkgenv]setenv}
     # Sage scripts such as sage-runtests like to use $HOME/.sage
                              HOME={envdir}
+    # Stop 'sage -t --installed' from picking up doc installed in SAGE_LOCAL
+                             SAGE_DOC=/doesnotexist
+                             KNOWN_TEST_FAILURES={toxinidir}/known-test-failures.json
+    # See src/bin/sage-env
+                             PYDEVD_DISABLE_FILE_VALIDATION=1
 
 allowlist_externals =
     bash
@@ -61,7 +68,7 @@ commands =
     {envpython} -c 'import sys; "" in sys.path and sys.path.remove(""); from sage.categories.all import *; SimplicialComplexes(); FunctionFields()'
 
     bash -c 'cd $(python -c "import sys; \"\" in sys.path and sys.path.remove(\"\"); from sage.env import SAGE_LIB; print(SAGE_LIB)") \
-        && sage-runtests -p --initial --environment=sage.all__sagemath_categories --probe all --baseline-stats-path={toxinidir}/known-test-failures.json --optional=sage --installed'
+        && sage-runtests -p --force-lib --initial --environment=sage.all__sagemath_categories --probe all --baseline-stats-path=$KNOWN_TEST_FAILURES --optional=sage --installed'
 
 [testenv:.tox]
 # Allow access to PyPI for auto-provisioning a suitable tox version
@@ -84,6 +91,11 @@ setenv =                     {[pkgenv]setenv}
 
 basepython = {env:SAGE_VENV}/bin/python3
 
+[testenv:.pkg-sagepython-sagewheels-nopypi-editable]
+config_settings_build_editable =
+                             editable_mode = strict
+
+
 [testenv:sagepython]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
@@ -92,10 +104,6 @@ package_env = .pkg-sagepython
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython-sagewheels-nopypi
 
-[testenv:sagepython-sagewheels-nopypi-norequirements]
-basepython = {env:SAGE_VENV}/bin/python3
-package_env = .pkg-sagepython-sagewheels-nopypi
-
 [testenv:sagepython-sagewheels]
 basepython = {env:SAGE_VENV}/bin/python
 package_env = .pkg-sagepython
@@ -103,3 +111,16 @@ package_env = .pkg-sagepython
 [testenv:sagepython-norequirements]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
+
+
+[testenv:sagepython-sagewheels-nopypi-norequirements]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi
+
+[testenv:sagepython-sagewheels-nopypi-editable]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi-editable
+package = editable
+deps = -r requirements-editable.txt
+config_settings_build_editable =
+                             editable_mode = strict
diff --git a/pkgs/sagemath-environment/requirements-editable.txt.m4 b/pkgs/sagemath-environment/requirements-editable.txt.m4
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/pkgs/sagemath-environment/tox.ini b/pkgs/sagemath-environment/tox.ini
index 6bf1f2a6ebb..5d741bd0b48 100644
--- a/pkgs/sagemath-environment/tox.ini
+++ b/pkgs/sagemath-environment/tox.ini
@@ -13,7 +13,9 @@ envlist =
 requires =
     # Auto-provision a modern tox.
     # [pkgenv] added in 4.2 - https://tox.wiki/en/latest/upgrading.html#packaging-configuration-and-inheritance
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2
+    tox<4.14.1
 
 [pkgenv]
 # Environment in which to build the sdist.
@@ -49,6 +51,9 @@ passenv =                    {[pkgenv]passenv}
 setenv =                     {[pkgenv]setenv}
     # Sage scripts such as sage-runtests like to use $HOME/.sage
                              HOME={envdir}
+    # Stop 'sage -t --installed' from picking up doc installed in SAGE_LOCAL
+                             SAGE_DOC=/doesnotexist
+                             KNOWN_TEST_FAILURES={toxinidir}/known-test-failures.json
 
 allowlist_externals =
     bash
@@ -78,6 +83,11 @@ setenv =                     {[pkgenv]setenv}
 
 basepython = {env:SAGE_VENV}/bin/python3
 
+[testenv:.pkg-sagepython-sagewheels-nopypi-editable]
+config_settings_build_editable =
+                             editable_mode = strict
+
+
 [testenv:sagepython]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
@@ -98,3 +108,11 @@ package_env = .pkg-sagepython
 [testenv:sagepython-sagewheels-nopypi-norequirements]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython-sagewheels-nopypi
+
+[testenv:sagepython-sagewheels-nopypi-editable]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi-editable
+package = editable
+deps = -r requirements-editable.txt
+config_settings_build_editable =
+                             editable_mode = strict
diff --git a/pkgs/sagemath-objects/requirements-editable.txt.m4 b/pkgs/sagemath-objects/requirements-editable.txt.m4
new file mode 100644
index 00000000000..df9b22b43aa
--- /dev/null
+++ b/pkgs/sagemath-objects/requirements-editable.txt.m4
@@ -0,0 +1,4 @@
+include(`sage_spkg_versions.m4')dnl
+dnl Same as setup.cfg.m4 install_requires; FIXME: should pin to built wheels.
+SPKG_INSTALL_REQUIRES_gmpy2
+SPKG_INSTALL_REQUIRES_cysignals
diff --git a/pkgs/sagemath-objects/tox.ini b/pkgs/sagemath-objects/tox.ini
index a8f5a6d6a76..a7b91f55990 100644
--- a/pkgs/sagemath-objects/tox.ini
+++ b/pkgs/sagemath-objects/tox.ini
@@ -13,7 +13,9 @@ envlist =
 requires =
     # Auto-provision a modern tox.
     # [pkgenv] added in 4.2 - https://tox.wiki/en/latest/upgrading.html#packaging-configuration-and-inheritance
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2
+    tox<4.14.1
 
 [pkgenv]
 # Environment in which to build the sdist.
@@ -49,6 +51,9 @@ passenv =                    {[pkgenv]passenv}
 setenv =                     {[pkgenv]setenv}
     # Sage scripts such as sage-runtests like to use $HOME/.sage
                              HOME={envdir}
+    # Stop 'sage -t --installed' from picking up doc installed in SAGE_LOCAL
+                             SAGE_DOC=/doesnotexist
+                             KNOWN_TEST_FAILURES={toxinidir}/known-test-failures.json
 
 allowlist_externals =
     bash
@@ -82,6 +87,11 @@ setenv =                     {[pkgenv]setenv}
 
 basepython = {env:SAGE_VENV}/bin/python3
 
+[testenv:.pkg-sagepython-sagewheels-nopypi-editable]
+config_settings_build_editable =
+                             editable_mode = strict
+
+
 [testenv:sagepython]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
@@ -102,3 +112,11 @@ package_env = .pkg-sagepython
 [testenv:sagepython-sagewheels-nopypi-norequirements]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython-sagewheels-nopypi
+
+[testenv:sagepython-sagewheels-nopypi-editable]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi-editable
+package = editable
+deps = -r requirements-editable.txt
+config_settings_build_editable =
+                             editable_mode = strict
diff --git a/pkgs/sagemath-repl/pyproject.toml.m4 b/pkgs/sagemath-repl/pyproject.toml.m4
index 2d2f13008be..459a599f1fb 100644
--- a/pkgs/sagemath-repl/pyproject.toml.m4
+++ b/pkgs/sagemath-repl/pyproject.toml.m4
@@ -13,8 +13,10 @@ description = "Sage: Open Source Mathematics Software: IPython kernel, Sage prep
 dependencies = [
     SPKG_INSTALL_REQUIRES_sagemath_objects
     SPKG_INSTALL_REQUIRES_sagemath_environment
+    SPKG_INSTALL_REQUIRES_ipykernel
     SPKG_INSTALL_REQUIRES_ipython
     SPKG_INSTALL_REQUIRES_ipywidgets
+    SPKG_INSTALL_REQUIRES_jupyter_client
 ]
 dynamic = ["version"]
 include(`pyproject_toml_metadata.m4')dnl'
diff --git a/pkgs/sagemath-repl/requirements-editable.txt.m4 b/pkgs/sagemath-repl/requirements-editable.txt.m4
new file mode 100644
index 00000000000..fa89ade7621
--- /dev/null
+++ b/pkgs/sagemath-repl/requirements-editable.txt.m4
@@ -0,0 +1,11 @@
+include(`sage_spkg_versions.m4')dnl
+dnl Same as setup.cfg.m4 install_requires (+ their install-requires)
+dnl FIXME: should pin to built wheels.
+SPKG_INSTALL_REQUIRES_gmpy2
+SPKG_INSTALL_REQUIRES_cysignals
+SPKG_INSTALL_REQUIRES_memory_allocator
+SPKG_INSTALL_REQUIRES_ipython
+SPKG_INSTALL_REQUIRES_ipywidgets
+dnl To be added when ready for editable:
+-e ../sagemath-environment
+-e ../sagemath-objects
diff --git a/pkgs/sagemath-repl/tox.ini b/pkgs/sagemath-repl/tox.ini
index 679153a2947..d7b557761ac 100644
--- a/pkgs/sagemath-repl/tox.ini
+++ b/pkgs/sagemath-repl/tox.ini
@@ -13,7 +13,9 @@ envlist =
 requires =
     # Auto-provision a modern tox.
     # [pkgenv] added in 4.2 - https://tox.wiki/en/latest/upgrading.html#packaging-configuration-and-inheritance
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2
+    tox<4.14.1
 
 [pkgenv]
 # Environment in which to build the sdist.
@@ -49,6 +51,11 @@ passenv =                    {[pkgenv]passenv}
 setenv =                     {[pkgenv]setenv}
     # Sage scripts such as sage-runtests like to use $HOME/.sage
                              HOME={envdir}
+    # Stop 'sage -t --installed' from picking up doc installed in SAGE_LOCAL
+                             SAGE_DOC=/doesnotexist
+                             KNOWN_TEST_FAILURES={toxinidir}/known-test-failures.json
+    # See src/bin/sage-env
+                             PYDEVD_DISABLE_FILE_VALIDATION=1
 
 allowlist_externals =
     bash
@@ -57,7 +64,7 @@ commands =
     # Beware of the treacherous non-src layout. "./sage/" shadows the installed sage package.
     {envpython} -c 'import sys; "" in sys.path and sys.path.remove(""); import sage.repl.all; import sage.doctest.all'
 
-    bash -c 'cd $({envpython} -c "import sys; \"\" in sys.path and sys.path.remove(\"\"); from sage.env import SAGE_LIB; print(SAGE_LIB)") && sage-runtests -p --environment=sage.all__sagemath_repl --baseline-stats-path={toxinidir}/known-test-failures.json --initial --optional=sage sage/repl sage/doctest sage/misc/sage_input.py sage/misc/sage_eval.py'
+    bash -c 'cd $({envpython} -c "import sys; \"\" in sys.path and sys.path.remove(\"\"); from sage.env import SAGE_LIB; print(SAGE_LIB)") && sage-runtests -p --environment=sage.all__sagemath_repl --baseline-stats-path=$KNOWN_TEST_FAILURES --initial --optional=sage sage/repl sage/doctest sage/misc/sage_input.py sage/misc/sage_eval.py'
 
 [testenv:.tox]
 # Allow access to PyPI for auto-provisioning a suitable tox version
@@ -80,6 +87,11 @@ setenv =                     {[pkgenv]setenv}
 
 basepython = {env:SAGE_VENV}/bin/python3
 
+[testenv:.pkg-sagepython-sagewheels-nopypi-editable]
+config_settings_build_editable =
+                             editable_mode = strict
+
+
 [testenv:sagepython]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
@@ -88,10 +100,6 @@ package_env = .pkg-sagepython
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython-sagewheels-nopypi
 
-[testenv:sagepython-sagewheels-nopypi-norequirements]
-basepython = {env:SAGE_VENV}/bin/python3
-package_env = .pkg-sagepython-sagewheels-nopypi
-
 [testenv:sagepython-sagewheels]
 basepython = {env:SAGE_VENV}/bin/python
 package_env = .pkg-sagepython
@@ -99,3 +107,16 @@ package_env = .pkg-sagepython
 [testenv:sagepython-norequirements]
 basepython = {env:SAGE_VENV}/bin/python3
 package_env = .pkg-sagepython
+
+
+[testenv:sagepython-sagewheels-nopypi-norequirements]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi
+
+[testenv:sagepython-sagewheels-nopypi-editable]
+basepython = {env:SAGE_VENV}/bin/python3
+package_env = .pkg-sagepython-sagewheels-nopypi-editable
+package = editable
+deps = -r requirements-editable.txt
+config_settings_build_editable =
+                             editable_mode = strict
diff --git a/pkgs/sagemath-standard/tox.ini b/pkgs/sagemath-standard/tox.ini
index 6aae1ef1bfa..c197f49d9be 100644
--- a/pkgs/sagemath-standard/tox.ini
+++ b/pkgs/sagemath-standard/tox.ini
@@ -62,7 +62,9 @@ envlist =
 requires =
     # Auto-provision a modern tox.
     # [pkgenv] added in 4.2 - https://tox.wiki/en/latest/upgrading.html#packaging-configuration-and-inheritance
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2
+    tox<4.14.1
 
 [pkgenv]
 # Environment in which to build the sdist.
diff --git a/src/sage/doctest/reporting.py b/src/sage/doctest/reporting.py
index 600a18b0e8d..74b823becc2 100644
--- a/src/sage/doctest/reporting.py
+++ b/src/sage/doctest/reporting.py
@@ -145,7 +145,8 @@ def were_doctests_with_optional_tag_run(self, tag):
         When latex is available, doctests marked with optional tag
         ``latex`` are run by default since :issue:`32174`::
 
-            sage: filename = os.path.join(SAGE_SRC,'sage','misc','latex.py')
+            sage: # needs SAGE_SRC
+            sage: filename = os.path.join(SAGE_SRC, 'sage', 'misc', 'latex.py')
             sage: DC = DocTestController(DocTestDefaults(), [filename])
             sage: DTR = DocTestReporter(DC)
             sage: DTR.were_doctests_with_optional_tag_run('latex')   # optional - latex
diff --git a/src/sage/features/__init__.py b/src/sage/features/__init__.py
index a8b11ef7db5..ebeb55527a8 100644
--- a/src/sage/features/__init__.py
+++ b/src/sage/features/__init__.py
@@ -948,7 +948,10 @@ def _is_present(self):
             # Available since https://setuptools.pypa.io/en/latest/history.html#v59-0-0
             from setuptools.errors import CCompilerError
         except ImportError:
-            from distutils.errors import CCompilerError
+            try:
+                from distutils.errors import CCompilerError
+            except ImportError:
+                CCompilerError = ()
         with open(tmp_filename(ext=".pyx"), 'w') as pyx:
             pyx.write(self.test_code)
         try:
diff --git a/src/tox.ini b/src/tox.ini
index aab671441a9..57a7a11aaa9 100644
--- a/src/tox.ini
+++ b/src/tox.ini
@@ -26,8 +26,10 @@ envlist = doctest, coverage, startuptime, pycodestyle-minimal, relint, codespell
 skipsdist = true
 
 requires =
-    # For the renamed "allowlist_externals" keyword
+    # For the renamed "allowlist_externals" keyword, need >= 3.18
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=3.18
+    tox<4.14.1
 
 [sagedirect]
 # Base for tox environments that bypass the virtual environment set up by tox,
diff --git a/tox.ini b/tox.ini
index 837764e6441..1ed1352e187 100644
--- a/tox.ini
+++ b/tox.ini
@@ -129,8 +129,10 @@ envlist =
     # pycodestyle
 
 requires =
-    # For repaired numerical factors in tox 4:
+    # For repaired numerical factors in tox 4, need >= 4.2.7.
+    # Because of https://github.com/tox-dev/tox/issues/3238, need <4.14.1
     tox>=4.2.7
+    tox<4.14.1
 
 skipsdist = true