diff --git a/smop/libscripts/Makefile b/smop/libscripts/Makefile
index ac3ef1bb..be19d467 100644
--- a/smop/libscripts/Makefile
+++ b/smop/libscripts/Makefile
@@ -6,6 +6,7 @@ PYFILES= $(sort $(subst .m,.py,$(notdir $(MFILES) )))
 MFILES = $(shell find $(SCRIPTS) -name \*.m -type f)
 CYTHON = cython
 PYTHON = python
+CAT    = cat
 XFILES = -x white.m,summer.m,spring.m,rainbow.m,prism.m,pink.m,ocean.m,lines.m,jet.m
 FLAGS  = 
 SMOP   = $(PYTHON) ../main.py
@@ -20,6 +21,6 @@ clean:
 
 %.py: %.m
 	$(SMOP) $^ $(FLAGS) $(XFILES)
-	($(PYTHON) $@ && cat $@ >> libscripts.py)
+	($(PYTHON) $@ && $(CAT) $@ >> libscripts.py)