Fix macos and linux builds on CI farm

indra/CMakeLists.txt

@@ -14,7 +14,11 @@ project(${ROOT_PROJECT_NAME})
 set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 
 set(CMAKE_C_STANDARD 11)
-set(CMAKE_CXX_STANDARD 20)
+if(MSVC)
+  set(CMAKE_CXX_STANDARD 20)
+else()
+  set(CMAKE_CXX_STANDARD 17)
+endif()
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)