This is an internal function used once; we can just rename it.

--- a/libclamav/mpool.c	2024-09-03 14:18:28.000000000 -0400
+++ b/libclamav/mpool.c	2026-03-08 12:04:26.313585301 -0400
@@ -422,7 +422,7 @@
     return fragsz[bits];
 }
 
-static inline unsigned int alignof(size_t size)
+static inline unsigned int _clamav_alignof(size_t size)
 {
     /* conservative estimate of alignment.
      * A struct that needs alignment of 'align' is padded by the compiler
@@ -618,7 +618,7 @@
 
 void *mpool_malloc(struct MP *mp, size_t size)
 {
-    size_t align = alignof(size);
+    size_t align = _clamav_alignof(size);
     size_t i, needed = align_increase(size + FRAG_OVERHEAD, align);
     const unsigned int sbits = to_bits(needed);
     struct FRAG *f           = NULL;