libhsakmt is a part of dev-libs/roct-thunk-interface
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,11 +112,16 @@ if (NOT DEFINED BUILD_THUNK_VIRTIO)
   set(BUILD_THUNK_VIRTIO OFF)
 endif()
 
+if (BUILD_HSAKMT)
 add_rocm_subdir(libhsakmt "${THUNK_DEFINITIONS}")
 set_target_properties(hsakmt PROPERTIES
                                 ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/libhsakmt/archive"
                                 LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/libhsakmt/lib"
                                 RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/libhsakmt/runtime")
+else()
+  find_package(hsakmt REQUIRED)
+  add_library(hsakmt ALIAS hsakmt::hsakmt)
+endif()
 if (WIN32)
 set_target_properties(hsakmt PROPERTIES
                       CXX_STANDARD 20