diff --git a/cricket/Makefile b/cricket/Makefile
index 771b787..775b35d 100644
--- a/cricket/Makefile
+++ b/cricket/Makefile
@@ -36,4 +36,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.BIN $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@
diff --git a/dclock/Makefile b/dclock/Makefile
index b67c0b5..814cf7c 100644
--- a/dclock/Makefile
+++ b/dclock/Makefile
@@ -31,4 +31,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@
diff --git a/ns.clock/Makefile b/ns.clock/Makefile
index 25b6c11..89f632c 100644
--- a/ns.clock/Makefile
+++ b/ns.clock/Makefile
@@ -31,4 +31,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@
diff --git a/quit/Makefile b/quit/Makefile
index 36f1ed1..91764ab 100644
--- a/quit/Makefile
+++ b/quit/Makefile
@@ -31,4 +31,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@
diff --git a/ram.drv/Makefile b/ram.drv/Makefile
index a104871..29808b3 100644
--- a/ram.drv/Makefile
+++ b/ram.drv/Makefile
@@ -31,4 +31,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@
diff --git a/selectors/Makefile b/selectors/Makefile
index 15fe9c6..85127ba 100644
--- a/selectors/Makefile
+++ b/selectors/Makefile
@@ -34,4 +34,4 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
-	xattr -wx prodos.AuxType '00 20' $@
+	command -v xattr &> /dev/null && xattr -wx prodos.AuxType '00 20' $@