diff --git a/include/acl/alignof.h b/include/acl/alignof.h
new file mode 100644
index 0000000..cb95762
--- /dev/null
+++ b/include/acl/alignof.h
@@ -0,0 +1,16 @@
+#if defined(__STDC__)
+#if (__STDC_VERSION__ >= 201112L)
+#include <stdalign.h>
+#include <stddef.h>
+#else
+#define alignof(type) offsetof(struct { char c; type d; }, d)
+typedef union {
+	double dummy_double;
+	long double dummy_long_double;
+	long long dummy_long_long;
+        void *dummy_ptr;
+        void (*dummy_func_ptr)(void);
+} max_align_t;
+#endif
+#endif
+#include <stdio.h>
diff --git a/include/acl/hashmap.h b/include/acl/hashmap.h
index f5dcbc3..c0377ac 100644
--- a/include/acl/hashmap.h
+++ b/include/acl/hashmap.h
@@ -15,4 +15,5 @@ union acl_hashmap_meta {
 union acl_hashmap_meta* acl_hashmap_init(size_t bucketCount, size_t sizeOneElement, size_t offset, size_t keySize);
 void* acl_hashmap_declare(union acl_hashmap_meta *hashmap_meta, void *key);
 void* acl_hashmap_get(union acl_hashmap_meta *hashmap_meta, void *key);
+bool acl_hashmap_remove;
 #endif
diff --git a/include/acl/sizeof.h b/include/acl/sizeof.h
new file mode 100644
index 0000000..ee2e61b
--- /dev/null
+++ b/include/acl/sizeof.h
@@ -0,0 +1,4 @@
+/* The following macro alows the usage of the sizeof operator without an identifier */
+#include <stddef.h>
+#define acl_sizeof(type) offsetof(struct{type a; char b;}, b)
+offsetof(struct{type a; char b;}, b)