-extern elf_vma (*byte_get) (unsigned char *, int);
-extern elf_vma byte_get_signed (unsigned char *, int);
-extern elf_vma byte_get_little_endian (unsigned char *, int);
-extern elf_vma byte_get_big_endian (unsigned char *, int);
-extern void byte_get_64 (unsigned char *, elf_vma *, elf_vma *);
+extern elf_vma (*byte_get) (const unsigned char *, int);
+extern elf_vma byte_get_signed (const unsigned char *, int);
+extern elf_vma byte_get_little_endian (const unsigned char *, int);
+extern elf_vma byte_get_big_endian (const unsigned char *, int);
+extern void byte_get_64 (const unsigned char *, elf_vma *, elf_vma *);