updated for version 7.3.1193
Problem:    fail_if_missing not used for Python 3.
Solution:   Give an error when Python 3 can't be configured. (Andrei Olsen)
diff --git a/src/auto/configure b/src/auto/configure
index 0d1c563..ba9ae56 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -5826,6 +5826,9 @@
 $as_echo "too old" >&6; }
     fi
   fi
+  if test "$fail_if_missing" = "yes" -a "$python3_ok" != "yes"; then
+    as_fn_error "could not configure python3" "$LINENO" 5
+  fi
 fi