Refining.

Author: aentinger

Diff for: docs/07-faq-compilation-failure.md

@@ -30,6 +30,11 @@ To fix this in the "class-wrapping" method, don't write forward declarations.
 ```diff
 - int myFunc(int const a, int const b);
 ```
+or declare them `static`. Note: This may have unintended side effects.
+```diff
+- int myFunc(int const a, int const b);
++ static int myFunc(int const a, int const b);
+```
 
 ### Beware of the right function signature for callback functions
 ```C++