From ff38b8715a44091d04e5dc82a2342a35693ea51b Mon Sep 17 00:00:00 2001
From: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
Date: Sun, 7 Aug 2022 03:58:21 -0400
Subject: [PATCH] error if LAMMPS_VERSION_NUMBER is not defined

Ref: https://stackoverflow.com/a/2221535/9567349

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
---
 source/lmp/pair_deepmd.h.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/source/lmp/pair_deepmd.h.in b/source/lmp/pair_deepmd.h.in
index 6c2373e114..9b7480272b 100644
--- a/source/lmp/pair_deepmd.h.in
+++ b/source/lmp/pair_deepmd.h.in
@@ -1,3 +1,7 @@
+#ifndef LAMMPS_VERSION_NUMBER
+#error Please define LAMMPS_VERSION_NUMBER to yyyymmdd
+#endif
+
 #ifdef PAIR_CLASS
 
 PairStyle(deepmd,PairDeepMD)