diff --git a/lisp/llvm-lib/llvm-shared.el b/lisp/llvm-lib/llvm-shared.el
index db7c6d8..ad92ba0 100644
--- a/lisp/llvm-lib/llvm-shared.el
+++ b/lisp/llvm-lib/llvm-shared.el
@@ -50,7 +50,8 @@
    ;; Cached compilation command options
    (target-clang-opts :initarg :clang-opts :initform nil)
    ;; Target + CPU -> compilation command options
-   (target-clang-opts-fun :initarg :clang-opts-fun :type function :initform (lambda ()))))
+   (target-clang-opts-fun :initarg :clang-opts-fun :type function :initform (lambda ()))
+   (aux-props :initarg :aux-props :type list :initform nil)))
 
 ;; (defvar lls/llvm-config nil)
 
@@ -79,6 +80,12 @@
       (slot-value conf sym)
     nil))
 
+(defun lls/conf-aux-get (sym)
+  (lls/ensure-initialized)
+  (-->
+   (lls/conf-get 'aux-props)
+   (alist-get sym it)))
+
 (defun lls/conf-set (key val)
   (lls/ensure-initialized)
   (setf (slot-value (lls/get-llvm-config) key)