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diff --git a/lib/ext2fs/ext4_acl.h b/lib/ext2fs/ext4_acl.h
index 8d4d974..297df1b 100644
--- a/lib/ext2fs/ext4_acl.h
+++ b/lib/ext2fs/ext4_acl.h
@@ -1,3 +1,11 @@
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_MINOR__
+# define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+# else
+# define __GNUC_PREREQ(maj, min) 0
+# endif
+#endif
+
/*
* Ext4's on-disk acl format. From linux/fs/ext4/acl.h
*/
diff --git a/lib/ext2fs/hashmap.h b/lib/ext2fs/hashmap.h
index 228f439..fdc8e7f 100644
--- a/lib/ext2fs/hashmap.h
+++ b/lib/ext2fs/hashmap.h
@@ -4,6 +4,14 @@
# include <stdlib.h>
# include <stdint.h>
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_MINOR__
+# define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+# else
+# define __GNUC_PREREQ(maj, min) 0
+# endif
+#endif
+
struct ext2fs_hashmap {
uint32_t size;
uint32_t(*hash)(const void *key, size_t len);
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