Index: pacemaker-1.1.18+20180112.bd7115b8c/configure.ac
===================================================================
--- pacemaker-1.1.18+20180112.bd7115b8c.orig/configure.ac
+++ pacemaker-1.1.18+20180112.bd7115b8c/configure.ac
@@ -493,7 +493,7 @@ dnl Replacing AC_PROG_LIBTOOL with AC_CH
 dnl was NOT being expanded all the time thus causing things to fail.
 AC_CHECK_PROGS(LIBTOOL, glibtool libtool libtool15 libtool13)
 
-AM_PATH_PYTHON
+AM_PATH_PYTHON([3])
 AC_CHECK_PROGS(MAKE, gmake make)
 AC_PATH_PROGS(HTML2TXT, lynx w3m)
 AC_PATH_PROGS(HELP2MAN, help2man)