diff -rupN harfbuzz-2.5.1/src/gen-def.py harfbuzz-2.5.1-new/src/gen-def.py
--- harfbuzz-2.5.1/src/gen-def.py	2019-05-06 21:14:20.000000000 +0200
+++ harfbuzz-2.5.1-new/src/gen-def.py	2019-06-03 13:49:38.726463447 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 from __future__ import print_function, division, absolute_import