Update

src/examples/Makefile

+SRCDIR = ..
+
+PROGS = cat cmp cp echo halt hex-dump ls mcat mcp mkdir pwd rm shell \
+	bubsort insult lineup matmult recursor
+
+cat_SRC = cat.c
+cmp_SRC = cmp.c
+cp_SRC = cp.c
+echo_SRC = echo.c
+halt_SRC = halt.c
+hex-dump_SRC = hex-dump.c
+insult_SRC = insult.c
+lineup_SRC = lineup.c
+ls_SRC = ls.c
+recursor_SRC = recursor.c
+rm_SRC = rm.c
+bubsort_SRC = bubsort.c
+matmult_SRC = matmult.c
+mcat_SRC = mcat.c
+mcp_SRC = mcp.c
+mkdir_SRC = mkdir.c
+pwd_SRC = pwd.c
+shell_SRC = shell.c
+
+include $(SRCDIR)/Make.config
+include $(SRCDIR)/Makefile.userprog