From aa59f7bd91a03d4a35630badee979690441dcfc1 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 29 Sep 2021 07:50:53 -0400
Subject: [PATCH] must have patch command available to compile ScaFaCoS

---
 cmake/Modules/Packages/SCAFACOS.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmake/Modules/Packages/SCAFACOS.cmake b/cmake/Modules/Packages/SCAFACOS.cmake
index fd355420c3..de611a1edb 100644
--- a/cmake/Modules/Packages/SCAFACOS.cmake
+++ b/cmake/Modules/Packages/SCAFACOS.cmake
@@ -23,6 +23,11 @@ if(DOWNLOAD_SCAFACOS)
   file(DOWNLOAD ${LAMMPS_THIRDPARTY_URL}/scafacos-1.0.1-fix.diff ${CMAKE_CURRENT_BINARY_DIR}/scafacos-1.0.1.fix.diff
           EXPECTED_HASH MD5=4baa1333bb28fcce102d505e1992d032)
 
+  find_program(HAVE_PATCH patch)
+  if(NOT HAVE_PATCH)
+    message(FATAL_ERROR "The 'patch' program is required to build the ScaFaCoS library")
+  endif()
+
   include(ExternalProject)
   ExternalProject_Add(scafacos_build
     URL     ${SCAFACOS_URL}