diff -up FreeCAD-master/CMakeLists.txt.sopwith FreeCAD-master/CMakeLists.txt
--- FreeCAD-master/CMakeLists.txt.sopwith	2019-09-18 15:51:53.411979083 -0400
+++ FreeCAD-master/CMakeLists.txt	2019-09-18 15:52:06.835864739 -0400
@@ -781,7 +781,7 @@ if(NOT FREECAD_LIBPACK_USE OR FREECAD_LI
             set(SMESH_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/src/3rdParty/salomesmesh/inc)
 
         else(NOT FREECAD_USE_EXTERNAL_SMESH)
-            find_package(SMESH CONFIG)
+            find_package(SMESH REQUIRED)
             set (SMESH_INCLUDE_DIR ${SMESH_INCLUDE_PATH})
             set(EXTERNAL_SMESH_LIBS ${SMESH_LIBRARIES})
             if(NOT SMESH_FOUND)