From 7291733ac93fbc7a30255a7543729678d29afc21 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut
Date: Fri, 11 Jan 2019 15:45:15 +0100
Subject: configure: Update python search order

Some systems don't ship with "python" by default anymore, only
"python3" or "python2" or some combination, so include those in the
configure search.

Discussion: https://www.postgresql.org/message-id/flat/1457.1543184081%40sss.pgh.pa.us#c9cc1199338fd6a257589c6dcea6cf8d
---
 config/python.m4 | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'config/python.m4')

diff --git a/config/python.m4 b/config/python.m4
index 587bca99d52..9a4d12112e1 100644
--- a/config/python.m4
+++ b/config/python.m4
@@ -8,8 +8,15 @@
 # ----------------
 # Look for Python and set the output variable 'PYTHON' if found,
 # fail otherwise.
+#
+# As the Python 3 transition happens and PEP 394 isn't updated, we
+# need to cater to systems that don't have unversioned "python" by
+# default.  Some systems ship with "python3" by default and perhaps
+# have "python" in an optional package.  Some systems only have
+# "python2" and "python3", in which case it's reasonable to prefer the
+# newer version.
 AC_DEFUN([PGAC_PATH_PYTHON],
-[PGAC_PATH_PROGS(PYTHON, python)
+[PGAC_PATH_PROGS(PYTHON, [python python3 python2])
 if test x"$PYTHON" = x""; then
   AC_MSG_ERROR([Python not found])
 fi
-- 
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