Merge topic 'FindRuby-fix-version'

802d0aa0 FindRuby: Fix output check in _RUBY_CONFIG_VAR

Modules/FindRuby.cmake

@@ -90,7 +90,7 @@ if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
       RESULT_VARIABLE _RUBY_SUCCESS
       OUTPUT_VARIABLE _RUBY_OUTPUT
       ERROR_QUIET)
-    if(_RUBY_SUCCESS OR NOT _RUBY_OUTPUT)
+    if(_RUBY_SUCCESS OR _RUBY_OUTPUT STREQUAL "")
       execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['${RBVAR}']"
         RESULT_VARIABLE _RUBY_SUCCESS
         OUTPUT_VARIABLE _RUBY_OUTPUT