Switch away from pip3 for module installation and add license

source.sh

@@ -15,11 +15,14 @@ prepare() {
 # The build function is executed in the source directory
 # This function is used to compile the source code
 build() {
-  pip3 wheel -w dist --no-cache-dir --no-build-isolation --no-deps $PWD
+  python3 -m build --wheel --no-isolation .
 }
 
 # The package function is executed in the source directory
 # This function is used to move the compiled files into the output directory
 package() {
-  pip3 install --root="$BPM_OUTPUT" --ignore-installed --no-index --no-user --find-links dist Markupsafe
+  python3 -m installer --destdir "$BPM_OUTPUT" dist/*.whl
+
+  # Install package license
+  install -Dm644 "$BPM_SOURCE"/LICENSE.rst "$BPM_OUTPUT"/usr/share/licenses/python-markupsafe/LICENSE.rst
 }