diff --git a/build/pkgs/sagelib/spkg-install b/build/pkgs/sagelib/spkg-install
index 4ae18e5a42f..19e72f8e10e 100755
--- a/build/pkgs/sagelib/spkg-install
+++ b/build/pkgs/sagelib/spkg-install
@@ -1,4 +1,15 @@
 #!/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 $SAGE_ROOT the correct SAGE_ROOT?"
+    exit 1
+fi
+
 if [ "$SAGE_EDITABLE" = yes ]; then
     cd "$SAGE_SRC"
 else
@@ -44,7 +55,7 @@ if [ "$SAGE_EDITABLE" = yes ]; then
     # and renamed the distribution to "sagemath-standard").  There is no clean way to uninstall
     # them, so we just use rm.
     (cd "$SITEPACKAGESDIR" && rm -rf sage sage_setup sage-[1-9]*.egg-info sage-[1-9]*.dist-info)
-    time python3 -m pip install --verbose --no-deps --no-index --no-build-isolation --isolated --editable . || exit 1
+    time sdh_pip_editable_install .
 else
     # Likewise, we should remove the egg-link that may have been installed previously.
     (cd "$SITEPACKAGESDIR" && rm -f sagemath-standard.egg-link)