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diff --git a/source/luametatex/source/utilities/auxmemory.h b/source/luametatex/source/utilities/auxmemory.h
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+++ b/source/luametatex/source/utilities/auxmemory.h
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+/*
+    See license.txt in the root of this project.
+*/
+
+/*
+    Some operating systems come with |allocarray| so we use more verbose names. We cannot define
+    them because on some bsd/apple platforms |CLANG| cannot resolve them.
+
+*/
+
+# ifndef LMT_UTILITIES_MEMORY_H
+# define LMT_UTILITIES_MEMORY_H
+
+/*tex
+    This is an experiment. The impact of using an alternative allocator on native Windows makes a
+    native version some 5% faster than a cross compiled one. Otherwise the cross compiled version
+    outperforms the native one a bit. In \TEX\ and \METAPOST\ we already do something like this
+    but there we don't reclaim memory.
+
+*/
+
+# include <stdlib.h>
+# include <string.h>
+
+# if defined(LUAMETATEX_USE_MIMALLOC)
+    # include "libraries/mimalloc/include/mimalloc.h"
+    # define lmt_memory_malloc  mi_malloc
+    # define lmt_memory_calloc  mi_calloc
+    # define lmt_memory_realloc mi_realloc
+    # define lmt_memory_free    mi_free
+    # define lmt_memory_strdup  mi_strdup
+
+ // # include "libraries/mimalloc/include/mimalloc-override.h"
+
+# else
+    # define lmt_memory_malloc  malloc
+    # define lmt_memory_calloc  calloc
+    # define lmt_memory_realloc realloc
+    # define lmt_memory_free    free
+    # define lmt_memory_strdup  strdup
+# endif
+
+# define lmt_generic_malloc  malloc
+# define lmt_generic_calloc  calloc
+# define lmt_generic_realloc realloc
+# define lmt_generic_free    free
+# define lmt_generic_strdup  strdup
+
+extern void *aux_allocate_array       (int recordsize, int size, int reserved);
+extern void *aux_reallocate_array     (void *p, int recordsize, int size, int reserved);
+extern void *aux_allocate_clear_array (int recordsize, int size, int reserved);
+extern void  aux_deallocate_array     (void *p);
+
+# endif