Index: math/cadabra2/Makefile
===================================================================
--- math/cadabra2/Makefile
+++ math/cadabra2/Makefile
@@ -3,7 +3,7 @@
 
 PORTNAME=	cadabra2
 PORTVERSION=	2.1.2
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	math
 
 MAINTAINER=	yuri@rawbw.com
Index: math/cadabra2/files/patch-core_cadabra2.in
===================================================================
--- /dev/null
+++ math/cadabra2/files/patch-core_cadabra2.in
@@ -0,0 +1,13 @@
+Fix shebang via cmake -- instead of adding 
+  '/usr/bin/env python@PYTHON_POSTFIX' 
+to python_OLD_CMD, simply let cmake fill in the 
+copmlete python interpeter name.
+
+--- core/cadabra2.in.orig	2017-05-16 21:14:04 UTC
++++ core/cadabra2.in
+@@ -1,4 +1,4 @@
+-#!/usr/bin/env python@PYTHON_POSTFIX@
++#!@PYTHON_EXECUTABLE@
+ #
+ # \ingroup pythoncore
+ #