From a161e5ab4ef310d0639f10cf75a490b5106bfe0a Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Sun, 16 Feb 2014 15:53:08 +0000
Subject: [PATCH] Fix configure for binary specified by --with-python3

---
 configure.ac | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index 736395ac7..bb62068ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -707,15 +707,21 @@ AS_HELP_STRING([--with-python3=path], [Set location of Python 3.x executable]),[
 if test x"${PY3BIN}" = xno -o x"${with_alllang}" = xno ; then
   AC_MSG_NOTICE([Disabling Python 3.x support])
 else
-  for py_ver in 3 3.6 3.5 3.4 3.3 3.2 3.1 3.0; do
-    AC_CHECK_PROGS(PYTHON3, [python$py_ver])
-    if test -n "$PYTHON3"; then
-      AC_CHECK_PROGS(PY3CONFIG, [$PYTHON3-config])
-      if test -n "$PY3CONFIG"; then
-        break
+  if test "x$PY3BIN" = xyes; then
+    for py_ver in 3 3.6 3.5 3.4 3.3 3.2 3.1 3.0; do
+      AC_CHECK_PROGS(PYTHON3, [python$py_ver])
+      if test -n "$PYTHON3"; then
+        AC_CHECK_PROGS(PY3CONFIG, [$PYTHON3-config])
+        if test -n "$PY3CONFIG"; then
+          break
+        fi
       fi
-    fi
-  done
+    done
+  else
+    PYTHON3="$PY3BIN"
+    AC_CHECK_PROGS(PY3CONFIG, [$PYTHON3-config])
+  fi
+
 
   if test -n "$PYTHON3" -a -n "$PY3CONFIG"; then
     AC_MSG_CHECKING([for Python 3.x prefix])