From af7c6132000798d7a0d062cb26208e54a8285e3a Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 29 Sep 2021 07:50:13 -0400
Subject: [PATCH] portability improvement

---
 cmake/Modules/Packages/ML-QUIP.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/Modules/Packages/ML-QUIP.cmake b/cmake/Modules/Packages/ML-QUIP.cmake
index 5a80e63d55..92418e8939 100644
--- a/cmake/Modules/Packages/ML-QUIP.cmake
+++ b/cmake/Modules/Packages/ML-QUIP.cmake
@@ -50,7 +50,7 @@ if(DOWNLOAD_QUIP)
     GIT_TAG origin/public
     GIT_SHALLOW YES
     GIT_PROGRESS YES
-    PATCH_COMMAND cp ${CMAKE_BINARY_DIR}/quip.config <SOURCE_DIR>/arch/Makefile.lammps
+    PATCH_COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_BINARY_DIR}/quip.config <SOURCE_DIR>/arch/Makefile.lammps
     CONFIGURE_COMMAND env QUIP_ARCH=lammps make config
     BUILD_COMMAND env QUIP_ARCH=lammps make libquip
     INSTALL_COMMAND ""