diff --git a/Makefile b/Makefile
index da530a2..f3843ae 100644
--- a/Makefile
+++ b/Makefile
@@ -9,6 +9,8 @@ HEADERS = $(wildcard *.inc)
 TARGETS = \
 	$(OUTDIR)/basis.system.SYS
 
+XATTR := $(shell command -v xattr 2> /dev/null)
+
 .PHONY: clean all
 all: $(OUTDIR) $(TARGETS)
 
@@ -25,4 +27,6 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
+ifdef XATTR
 	xattr -wx prodos.AuxType '00 20' $@
+endif