diff -Nabur unzip60/crc32.c unzip604/crc32.c
--- unzip60/crc32.c	2007-01-22 13:34:38.000000000 +0800
+++ unzip604/crc32.c	2021-05-12 15:08:34.409893493 +0800
@@ -675,7 +675,32 @@
 
 #endif /* (IZ_CRC_BE_OPTIMIZ || IZ_CRC_LE_OPTIMIZ) */
 
+#ifdef ARCH_AARCH64
+u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len)
+{
+int64_t length = len;
+
+while ((length -= sizeof(u_int64_t)) >=0) {
+        __builtin_aarch64_crc32cx(crc, *((u_int64_t *)p));
+        p += sizeof(u_int64_t);
+}
 
+if (length & sizeof(u_int32_t)) {
+        __builtin_aarch64_crc32cw(crc, *((u_int32_t *)p));
+        p += sizeof(u_int32_t);
+}
+
+if (length & sizeof(u_int16_t)) {
+        __builtin_aarch64_crc32ch(crc, *((u_int16_t *)p));
+        p += sizeof(u_int16_t);
+}
+
+if (length & sizeof(u_int8_t))
+        __builtin_aarch64_crc32cb(crc, *p);
+
+return crc;
+}
+#else
 /* ========================================================================= */
 ulg crc32(crc, buf, len)
     ulg crc;                    /* crc shift register */
@@ -726,6 +751,9 @@
 
   return REV_BE(c) ^ 0xffffffffL;   /* (instead of ~c for 64-bit machines) */
 }
+
+#endif /* !ARCH_AARCH64*/
+
 #endif /* !ASM_CRC */
 #endif /* !CRC_TABLE_ONLY */
 #endif /* !USE_ZLIB */
diff -Nabur unzip60/crc32.h unzip604/crc32.h
--- unzip60/crc32.h	2008-03-09 02:40:20.000000000 +0800
+++ unzip604/crc32.h	2021-05-12 15:08:34.409893493 +0800
@@ -36,7 +36,11 @@
 #    undef IZ_CRC_BE_OPTIMIZ
 #  endif
 #else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
+#  ifdef ARCH_AARCH64
+  u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len);
+#  else
    ulg      crc32           OF((ulg crc, ZCONST uch *buf, extent len));
+#  endif 
 #endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
 
 #ifndef CRC_32_TAB
diff -Nabur unzip60/unix/Makefile unzip604/unix/Makefile
--- unzip60/unix/Makefile	2009-01-19 06:41:18.000000000 +0800
+++ unzip604/unix/Makefile	2021-05-12 15:09:05.698385219 +0800
@@ -40,7 +40,8 @@
 
 # Defaults most systems use (use LOCAL_UNZIP in environment to add flags,
 # such as -DDOSWILD).
-
+TARGET_ARCH = $(shell uname -m)
+ARCH = $(shell getconf LONG_BIT)
 # UnZip flags
 CC = cc#	try using "gcc" target rather than changing this (CC and LD
 LD = $(CC)#	must match, else "unresolved symbol:  ___main" is possible)
@@ -54,6 +55,12 @@
 LF = -o unzip$E $(LFLAGS1)
 LF2 = -s
 
+ifeq ($(TARGET_ARCH),aarch64)
+CFF = -DARCH=$(ARCH) -march=armv8.1-a -D ARCH_AARCH64
+else
+CFF =
+endif
+
 # UnZipSFX flags
 SL = -o unzipsfx$E $(LFLAGS1)
 SL2 = $(LF2)
@@ -77,6 +84,8 @@
 SHELL = /bin/sh
 MAKEF = -f unix/Makefile
 
+
+
 # Version info for unix/unix.c
 HOST_VERSINFO=-DIZ_CC_NAME='\"\$$(CC) \"' -DIZ_OS_NAME='\"`uname -a`\"'
 
@@ -231,13 +240,13 @@
 # yes, we should be able to use the $O macro to combine these two, but it
 # fails on some brain-damaged makes (e.g., AIX's)...no big deal
 .c.o:
-	$(CC) -c $(CF) $*.c
+	$(CC) -c $(CF) $(CFF)  $*.c
 
 .c.obj:
-	$(CC) -c $(CF) $*.c
+	$(CC) -c $(CF) $(CFF)  $*.c
 
 .c.pic.o:
-	$(CC) -c $(CF) -o $@ $*.c
+	$(CC) -c $(CF) $(CFF)  -o $@ $*.c
 
 # this doesn't work...directories are always a pain with implicit rules
 #.1.txt:		man/$<
@@ -329,7 +338,7 @@
 	$(CC) -c $(CF) -DSFX -o $@ unzip.c
 
 crc32_$O:	crc32.c $(UNZIP_H) zip.h crc32.h
-	$(CC) -c $(CF) -DSFX -o $@ crc32.c
+	$(CC) -c $(CF) -DSFX $(CFF)  -o $@ crc32.c
 
 crypt_$O:	crypt.c $(UNZIP_H) zip.h crypt.h crc32.h ttyio.h
 	$(CC) -c $(CF) -DSFX -o $@ crypt.c
