diff -rupN harfbuzz-2.1.0/src/gen-def.py harfbuzz-2.1.0-new/src/gen-def.py
--- harfbuzz-2.1.0/src/gen-def.py	2018-10-30 06:40:14.000000000 +0100
+++ harfbuzz-2.1.0-new/src/gen-def.py	2018-11-05 13:17:37.554469712 +0100
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 from __future__ import print_function, division, absolute_import