scripts/manage in rvm-1.0.17 vs scripts/manage in rvm-1.0.18

@@ -4,9 +4,11 @@
 original_ruby_string=${rvm_ruby_string:-""}
 
 source "$rvm_path/scripts/base"
 source "$rvm_path/scripts/patches"
 
+unset RUBYLIB RUBYOPT # Sanity check.
+
 __rvm_check_for_clang()
 {
   if [[ -n "${rvm_clang_flag:-""}" ]] && ! command -v clang >/dev/null ; then
     "$rvm_path/scripts/log" "fail" "\nYou passed the --clang option and clang is not in your path. \nPlease try again or do not use --clang.\n"
     return 1