--- CMakeLists.txt.orig	2017-10-16 21:39:41 UTC
+++ CMakeLists.txt
@@ -7,9 +7,9 @@ INCLUDE(version)
 
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
 
-FIND_PACKAGE(PythonInterp 2 REQUIRED)
-IF (NOT PYTHON_VERSION_MAJOR EQUAL 2)
-  MESSAGE(FATAL_ERROR "Python 2 is required.")
+FIND_PACKAGE(PythonInterp 3 REQUIRED)
+IF (NOT PYTHON_VERSION_MAJOR EQUAL 3)
+  MESSAGE(FATAL_ERROR "Python 3 is required.")
 ENDIF()
 
 FIND_PROGRAM(CTYPESGEN_FOUND ctypesgen.py)