diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index d409480..64f1a5f 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -85,12 +85,18 @@ endif()
 
 # ── Core CLI app (optional, requires CGAL + Viewer) ───────────────────────────
 if(WITH_CGAL)
+    # CGAL 6.x still needs Boost.Config headers unconditionally.
+    # Install via: brew install boost  (macOS)
+    #              apt install libboost-dev  (Debian/Ubuntu)
+    find_package(Boost REQUIRED)
+
     add_executable(${PROJECT_NAME} src/apps/v0/conformallab_cli.cpp)
     target_include_directories(${PROJECT_NAME} SYSTEM PRIVATE
         ${CMAKE_CURRENT_SOURCE_DIR}/deps/single_includes
         ${CMAKE_CURRENT_SOURCE_DIR}/deps/eigen-3.4.0/
         ${CMAKE_CURRENT_SOURCE_DIR}/deps/CGAL-6.1.1/include
-        ${CMAKE_CURRENT_SOURCE_DIR}/deps/libigl-2.6.0/include)
+        ${CMAKE_CURRENT_SOURCE_DIR}/deps/libigl-2.6.0/include
+        ${Boost_INCLUDE_DIRS})
     target_include_directories(${PROJECT_NAME} PRIVATE
         ${CMAKE_CURRENT_SOURCE_DIR}/include)
     target_compile_definitions(${PROJECT_NAME} PRIVATE