commit b6647a741b9091b82021ff46d4c112099d175d57
Author: Michael Orlitzky <michael@orlitzky.com>
Date:   Thu Nov 10 20:59:00 2022 -0500

    omalloc/omAllocSystem.c: add another include for malloc.h.
    
    There are two branches in this file, one for HAVE_MALLOC_SIZE and one
    for HAVE_MALLOC_USABLE_SIZE. The former includes malloc.h, and the
    latter needs to too; otherwise, malloc_usable_size() is undefined.
    
    This is caught by -Werror=implicit-function-declaration, which is
    likely to be enabled by default in future versions of GCC and clang.

diff --git a/omalloc/omAllocSystem.c b/omalloc/omAllocSystem.c
index b70a6292acf8ed80..62e20a57b8b53472 100644
--- a/omalloc/omAllocSystem.c
+++ b/omalloc/omAllocSystem.c
@@ -30,15 +30,19 @@
  *
  *******************************************************************/
 /* allocation of large addr */
-#if defined(HAVE_MALLOC_SIZE)
+
+#if defined(HAVE_MALLOC_SIZE) || defined(HAVE_MALLOC_USABLE_SIZE)
+  #include <stdlib.h>
   #ifdef HAVE_MALLOC_H
-  #include <malloc.h>
+    #include <malloc.h>
   #elif defined(HAVE_MALLOC_MALLOC_H)
-  #include <malloc/malloc.h>
+    #include <malloc/malloc.h>
   #endif
+#endif
+
+#if defined(HAVE_MALLOC_SIZE)
   #define _omSizeOfLargeAddr(addr) (malloc_size(addr))
 #elif defined(HAVE_MALLOC_USABLE_SIZE)
-  #include <stdlib.h>
   #define _omSizeOfLargeAddr(addr) (malloc_usable_size(addr))
 #else
 void* omAllocLarge(size_t size)