diff --git a/.travis.yml b/.travis.yml
index d4293de..626f887 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: enabled
-os: osx
+os: linux
 language: c
 
 install:
diff --git a/Makefile b/Makefile
index 7c6b891..543c38f 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,8 @@ OUTDIR = out
 
 TARGETS = $(OUTDIR)/chtype.BIN $(OUTDIR)/chtime.BIN
 
+XATTR := $(shell command -v xattr 2> /dev/null)
+
 .PHONY: clean all
 all: $(OUTDIR) $(TARGETS)
 
@@ -25,4 +27,6 @@ $(OUTDIR)/%.o: %.s $(HEADERS)
 
 $(OUTDIR)/%.BIN $(OUTDIR)/%.SYS: $(OUTDIR)/%.o
 	ld65 $(LDFLAGS) -o $@ $<
+ifdef XATTR
 	xattr -wx prodos.AuxType '00 20' $@
+endif