Fix build on ARM64/Apple Silicon by conditionally compiling x86-specific code

makefile

@@ -6,7 +6,20 @@ else
 endif
 
 BIN=pkg2zip${EXE}
-SRC=${wildcard pkg2zip*.c} miniz_tdef.c puff.c
+
+# Detect architecture
+UNAME_M := $(shell uname -m 2>/dev/null || echo unknown)
+
+# Base source files
+BASE_SRC := $(filter-out %_x86.c,$(wildcard pkg2zip*.c)) miniz_tdef.c puff.c
+
+# Add x86-specific files only on x86/x86_64 architectures
+ifneq ($(filter i386 i686 x86_64,$(UNAME_M)),)
+  SRC := $(BASE_SRC) $(wildcard pkg2zip*_x86.c)
+else
+  SRC := $(BASE_SRC)
+endif
+
 OBJ=${SRC:.c=.o}
 DEP=${SRC:.c=.d}
 
@@ -24,13 +37,16 @@ ${BIN}: ${OBJ}
 	@echo [L] $@
 	@${CC} ${LDFLAGS} -o $@ $^
 
+# x86-specific compilation rules (only on x86/x86_64)
+ifneq ($(filter i386 i686 x86_64,$(UNAME_M)),)
 %aes_x86.o: %aes_x86.c
 	@echo [C] $<
 	@${CC} ${CFLAGS} -maes -mssse3 -MMD -c -o $@ $<
 
 %crc32_x86.o: %crc32_x86.c
 	@echo [C] $<
 	@${CC} ${CFLAGS} -mpclmul -msse4 -MMD -c -o $@ $<
+endif
 
 %.o: %.c
 	@echo [C] $<