normalize shebang lines to #!/usr/bin/env python
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index dbb968e..14a3a8e 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
"""
This script is used to build the "official unofficial" universal build on
Mac OS X. It requires Mac OS X 10.4, Xcode 2.2 and the 10.4u SDK to do its
diff --git a/Mac/Tools/fixapplepython23.py b/Mac/Tools/fixapplepython23.py
index 6ba5401..03c799b 100644
--- a/Mac/Tools/fixapplepython23.py
+++ b/Mac/Tools/fixapplepython23.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
"""fixapplepython23 - Fix Apple-installed Python 2.3 (on Mac OS X 10.3)
Python 2.3 (and 2.3.X for X<5) have the problem that building an extension
diff --git a/Mac/scripts/zappycfiles.py b/Mac/scripts/zappycfiles.py
index a8193c1..d829159 100644
--- a/Mac/scripts/zappycfiles.py
+++ b/Mac/scripts/zappycfiles.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python
"""Recursively zap all .pyc and .pyo files"""
import os
import sys