diff --git a/Processes/UrQMD/CMakeLists.txt b/Processes/UrQMD/CMakeLists.txt
index 780e67f74617d0ba8ac939666aef0edba6929ff1..0fbdb064c86e4f8ab8e63dda4be96ff09b72004c 100644
--- a/Processes/UrQMD/CMakeLists.txt
+++ b/Processes/UrQMD/CMakeLists.txt
@@ -47,14 +47,11 @@ set (
 add_library (ProcessUrQMD STATIC ${MODEL_SOURCES})
 CORSIKA_COPY_HEADERS_TO_NAMESPACE (ProcessUrQMD ${MODEL_NAMESPACE} ${MODEL_HEADERS})
 
-find_package(Boost REQUIRED)
-
 set_target_properties (
   ProcessUrQMD
   PROPERTIES
   VERSION ${PROJECT_VERSION}
   SOVERSION 1
-#  PUBLIC_HEADER "${MODEL_HEADERS}"
   )
 
 # target dependencies on other libraries (also the header onlys)
diff --git a/ThirdParty/CMakeLists.txt b/ThirdParty/CMakeLists.txt
index b30fdf95b5289100a86006d4bd70c652eb93ef4a..b5b2ded0a154b2d591ca7fc3f4152dfa86482382 100644
--- a/ThirdParty/CMakeLists.txt
+++ b/ThirdParty/CMakeLists.txt
@@ -35,7 +35,7 @@ message (STATUS "USE_BOOST_C8='${USE_BOOST_C8}'")
 
 add_library (C8::ext::boost INTERFACE IMPORTED GLOBAL)
 if ("x_${USE_BOOST_C8}" STREQUAL "x_SYSTEM")
-  find_package (Boost REQUIRED COMPONENTS mp11 iterator core format interval optional type_index histogram)
+  find_package (Boost REQUIRED COMPONENTS mp11 iterator core format interval optional type_index histogram multi_array)
 
   message (STATUS "Using system-level boost version ${Boost_VERSION} at ${Boost_INCLUDE_DIR}")
   set_target_properties (