diff --git a/common/build-helper/python3.sh b/common/build-helper/python3.sh
new file mode 100644
index 00000000000..4707599ef0e
--- /dev/null
+++ b/common/build-helper/python3.sh
@@ -0,0 +1,16 @@
+# fix building non-pure-python modules on cross
+if [ -n "$CROSS_BUILD" ]; then
+	export PYPREFIX="$XBPS_CROSS_BASE"
+	export CFLAGS+=" -I${XBPS_CROSS_BASE}/${py3_inc} -I${XBPS_CROSS_BASE}/usr/include"
+	export LDFLAGS+=" -L${XBPS_CROSS_BASE}/${py3_lib} -L${XBPS_CROSS_BASE}/usr/lib"
+	export CC="${XBPS_CROSS_TRIPLET}-gcc -pthread $CFLAGS $LDFLAGS"
+	export LDSHARED="${CC} -shared $LDFLAGS"
+	export PYTHON_CONFIG="${XBPS_CROSS_BASE}/usr/bin/python3-config"
+	export PYTHONPATH="${XBPS_CROSS_BASE}/${py3_lib}"
+	for f in ${XBPS_CROSS_BASE}/${py3_lib}/_sysconfigdata_*; do
+		[ -f "$f" ] || continue
+		f=${f##*/}
+		_PYTHON_SYSCONFIGDATA_NAME=${f%.py}
+	done
+	[ -n "$_PYTHON_SYSCONFIGDATA_NAME" ] && export _PYTHON_SYSCONFIGDATA_NAME
+fi