clean *.osm as pointed out by Robert P. J. Day
diff --git a/Makefile b/Makefile
index 264f5b1..c6d6635 100644
--- a/Makefile
+++ b/Makefile
@@ -488,6 +488,7 @@
 	- find . -name \*.o -exec rm -f {} \;
 	- find . -name \*.om -exec rm -f {} \;
 	- find . -name \*.os -exec rm -f {} \;
+	- find . -name \*.osm -exec rm -f {} \;
 	- find . -name \*.a -exec rm -f {} \;
 
 distclean: clean