diff --git a/2015/endoh4/.gitignore b/2015/endoh4/.gitignore
index ea1749132..ffb16e793 100644
--- a/2015/endoh4/.gitignore
+++ b/2015/endoh4/.gitignore
@@ -1 +1,2 @@
 prog
+prog.alt
diff --git a/2015/endoh4/Makefile b/2015/endoh4/Makefile
index 95124ac19..be39c36f9 100644
--- a/2015/endoh4/Makefile
+++ b/2015/endoh4/Makefile
@@ -144,8 +144,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################