-- KFAC execution algorithm relies on the Aluminum (::Al) library, which
-- is only available when LBANN_HAS_ALUMINUM is enabled. Skip compiling
-- the KFAC implementation when Aluminum is disabled to avoid build errors
-- from undefined ::Al types.

--- src/execution_algorithms/CMakeLists.txt.orig	2026-08-01 17:36:16 UTC
+++ src/execution_algorithms/CMakeLists.txt
@@ -27,7 +27,6 @@ set_full_path(THIS_DIR_SOURCES
 set_full_path(THIS_DIR_SOURCES
   execution_context.cpp
   factory.cpp
-  kfac.cpp
   ltfb.cpp
   sgd_execution_context.cpp
   sgd_training_algorithm.cpp
@@ -35,8 +34,12 @@ set_full_path(THIS_DIR_SOURCES
   )
 
 # Add the support class implementations
-add_subdirectory(kfac)
 add_subdirectory(ltfb)
+
+if (LBANN_HAS_ALUMINUM)
+  list(APPEND THIS_DIR_SOURCES kfac.cpp)
+  add_subdirectory(kfac)
+endif ()
 
 # Propagate the files up the tree
 set(SOURCES "${SOURCES}" "${THIS_DIR_SOURCES}" PARENT_SCOPE)