--- a/cmake/DetectPackageBackend.cmake
+++ b/cmake/DetectPackageBackend.cmake
@@ -141,7 +141,9 @@
 endfunction()
 
 function(detect_package_backend)
-    _probe_amdrocm_packages()
+    if(NOT DEFINED CACHE{MIGRAPHX_PACKAGE_BACKEND})
+        _probe_amdrocm_packages()
+    endif()
 
     if(NOT DEFINED CACHE{MIGRAPHX_PACKAGE_BACKEND})
         # No explicit -D flag: auto-detect from installed amdrocm* packages.