Fixes in example Makefile under next/

next/Makefile.example

@@ -213,14 +213,14 @@ everything: all alt
 ###############
 
 clean:
-	${RM} -f ${OBJ}
+	${RM} -f ${OBJ} ${ALT_OBJ}
 	@-if [[ -f indent.c ]]; then \
 	    echo ${RM} -f indent.c; \
 	    ${RM} -f indent.c; \
 	fi
 
 clobber: clean
-	${RM} -f ${TARGET} *.dSYM
+	${RM} -f ${TARGET} ${ALT_TARGET} *.dSYM
 	@-if [[ -e sandwich ]]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \