diff --git a/gen/generate-bindings b/gen/generate-bindings
index b963c55..bc7041e 100755
--- a/gen/generate-bindings
+++ b/gen/generate-bindings
@@ -14,12 +14,22 @@ echo "# Import all versions" > __init__.py
 for v in $SPDX_VERSIONS; do
     MODNAME="v$(echo "$v" | sed 's/[^a-zA-Z0-9_]/_/g')"
 
-    shacl2code generate --input https://spdx.org/rdf/$v/spdx-model.ttl \
-        --input https://spdx.org/rdf/$v/spdx-json-serialize-annotations.ttl \
-        --context https://spdx.org/rdf/$v/spdx-context.jsonld \
-        --license Apache-2.0 \
-        python \
-        -o "$MODNAME.py"
+    if [ -n "${SHACL2CODE_SPDX_DIR}" ] && [ -d "${SHACL2CODE_SPDX_DIR}/$v" ]
+    then
+        shacl2code generate --input "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-model.ttl" \
+            --input "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-json-serialize-annotations.ttl" \
+            --context-url "file://${SHACL2CODE_SPDX_DIR}/$v/spdx-context.jsonld" https://spdx.org/rdf/$v/spdx-context.jsonld  \
+            --license Apache-2.0 \
+            python \
+            -o "$MODNAME.py"
+    else
+        shacl2code generate --input https://spdx.org/rdf/$v/spdx-model.ttl \
+            --input https://spdx.org/rdf/$v/spdx-json-serialize-annotations.ttl \
+            --context https://spdx.org/rdf/$v/spdx-context.jsonld \
+            --license Apache-2.0 \
+            python \
+            -o "$MODNAME.py"
+    fi
 
     echo "from . import $MODNAME" >> __init__.py
 done