Fedora's PackagingDrafts/MultilibTricks suggests the following
c-header wrapper example:
#include <bits/wordsize.h>
#if __WORDSIZE == 32
#include "config-32.h"
#elif __WORDSIZE == 64
#include "config-64.h"
#else
#error "Unknown word size"
#endif
Installing and using this wrapper is not really no-op, however; it
has been proven to cause include-ordering issues. So, even though
the shorter stub works in most cases, document why we still prefer
the longer #ifdef wrapper. Thanks to Vít Ondruch for pointing
this out.
Related: rhbz#1412274
