diff --git a/ext/curses/MANIFEST b/ext/curses/MANIFEST
index db5e54ffe8..e1a25d962d 100644
--- a/ext/curses/MANIFEST
+++ b/ext/curses/MANIFEST
@@ -1,5 +1,6 @@
 MANIFEST
 curses.c
+depend
 extconf.rb
 hello.rb
 rain.rb
diff --git a/ext/curses/depend b/ext/curses/depend
new file mode 100644
index 0000000000..ecb79e512d
--- /dev/null
+++ b/ext/curses/depend
@@ -0,0 +1 @@
+curses.o: curses.c $(hdrdir)/ruby.h $(topdir)/config.h $(hdrdir)/defines.h
diff --git a/ext/pty/MANIFEST b/ext/pty/MANIFEST
index 5e5af7dd6b..f46d611e5b 100644
--- a/ext/pty/MANIFEST
+++ b/ext/pty/MANIFEST
@@ -3,6 +3,7 @@ README
 README.expect
 README.expect.jp
 README.jp
+depend
 expect_sample.rb
 extconf.rb
 lib/expect.rb
diff --git a/ext/pty/depend b/ext/pty/depend
new file mode 100644
index 0000000000..888be6c301
--- /dev/null
+++ b/ext/pty/depend
@@ -0,0 +1 @@
+pty.o: pty.c $(hdrdir)/ruby.h $(topdir)/config.h $(hdrdir)/defines.h
diff --git a/ext/readline/MANIFEST b/ext/readline/MANIFEST
index f73a899abb..f8bfd1ea2c 100644
--- a/ext/readline/MANIFEST
+++ b/ext/readline/MANIFEST
@@ -1,4 +1,5 @@
 MANIFEST
 README
+depend
 extconf.rb
 readline.c
diff --git a/ext/readline/depend b/ext/readline/depend
new file mode 100644
index 0000000000..6570c5a036
--- /dev/null
+++ b/ext/readline/depend
@@ -0,0 +1 @@
+readline.o: readline.c $(hdrdir)/ruby.h $(topdir)/config.h $(hdrdir)/defines.h
diff --git a/ext/sdbm/MANIFEST b/ext/sdbm/MANIFEST
index d0ed99ba77..8888e69ad4 100644
--- a/ext/sdbm/MANIFEST
+++ b/ext/sdbm/MANIFEST
@@ -1,5 +1,6 @@
 MANIFEST
 _sdbm.c
+depend
 extconf.rb
 init.c
 sdbm.h
diff --git a/ext/sdbm/depend b/ext/sdbm/depend
new file mode 100644
index 0000000000..1d8b13d13f
--- /dev/null
+++ b/ext/sdbm/depend
@@ -0,0 +1,2 @@
+_sdbm.o: _sdbm.c $(hdrdir)/ruby.h $(topdir)/config.h $(hdrdir)/defines.h
+init.o: init.c $(hdrdir)/ruby.h $(topdir)/config.h $(hdrdir)/defines.h