-- Normalize imported CXX flags before invoking CMake.
-- Arbor exports ARB_CXX_FLAGS as a CMake list, which otherwise reaches make as
-- semicolon-separated shell commands and breaks catalogue builds in py-arbor tests.
-- This fixes the long-standing local test failure noted in upstream issue #2395.

--- scripts/arbor-build-catalogue.orig	2026-09-15 19:19:26 UTC
+++ scripts/arbor-build-catalogue
@@ -188,7 +188,8 @@ cmake = f"""
 find_package(arbor REQUIRED)
 {gpu_support}
 set(CMAKE_BUILD_TYPE release)
 set(CMAKE_CXX_COMPILER  {args["cxx"]})
-set(CMAKE_CXX_FLAGS     ${{ARB_CXX_FLAGS}})
+string(REPLACE ";" " " ARB_CXX_FLAGS_STR "${{ARB_CXX_FLAGS}}")
+set(CMAKE_CXX_FLAGS     "${{ARB_CXX_FLAGS_STR}}")
 
 include(BuildModules.cmake)