--- CMakeLists.txt.orig	2026-07-09 04:40:46 UTC
+++ CMakeLists.txt
@@ -168,9 +168,12 @@ configure_file(${DEFINES_HXX_CMAKE} ${DEFINES_HXX} @ON
 
 configure_file(${DEFINES_HXX_CMAKE} ${DEFINES_HXX} @ONLY)
 
+if(NOT DEFINED CATCH2_INCLUDE_DIR)
+  set(CATCH2_INCLUDE_DIR ${log4cplus_SOURCE_DIR}/catch/single_include/catch2)
+endif()
 include_directories (${log4cplus_SOURCE_DIR}/include
                      ${log4cplus_SOURCE_DIR}/threadpool
-                     ${log4cplus_SOURCE_DIR}/catch/single_include/catch2
+                     ${CATCH2_INCLUDE_DIR}
                      ${log4cplus_BINARY_DIR}/include
                     )