Index: cmake-4.0.0/Modules/FindRuby.cmake
===================================================================
--- cmake-4.0.0.orig/Modules/FindRuby.cmake
+++ cmake-4.0.0/Modules/FindRuby.cmake
@@ -286,7 +286,7 @@ if (Ruby_EXECUTABLE AND NOT Ruby_EXECUTA
   _RUBY_CONFIG_VAR("sitelibdir" Ruby_SITELIB_DIR)
 
   # vendor_ruby available ?
-  execute_process(COMMAND ${Ruby_EXECUTABLE} -r vendor-specific -e "print 'true'"
+  execute_process(COMMAND ${Ruby_EXECUTABLE} -r rbconfig -e "print 'true' unless RbConfig::CONFIG['vendorarchdir'].nil?"
                   OUTPUT_VARIABLE Ruby_HAS_VENDOR_RUBY ERROR_QUIET)
 
   if (Ruby_HAS_VENDOR_RUBY)