diff -rupN harfbuzz-1.8.1/src/gen-def.py harfbuzz-1.8.1-new/src/gen-def.py
--- harfbuzz-1.8.1/src/gen-def.py	2018-06-03 00:39:30.000000000 +0200
+++ harfbuzz-1.8.1-new/src/gen-def.py	2018-06-15 10:50:58.519983875 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 from __future__ import print_function, division, absolute_import