diff --git a/ext/.cvsignore b/ext/.cvsignore
new file mode 100644
index 0000000000..d8b8a61d92
--- /dev/null
+++ b/ext/.cvsignore
@@ -0,0 +1 @@
+extmk.rb
diff --git a/ext/curses/.cvsignore b/ext/curses/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/curses/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/dbm/.cvsignore b/ext/dbm/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/dbm/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/etc/.cvsignore b/ext/etc/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/etc/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/fcntl/.cvsignore b/ext/fcntl/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/fcntl/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/md5/.cvsignore b/ext/md5/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/md5/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/nkf/.cvsignore b/ext/nkf/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/nkf/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/pty/.cvsignore b/ext/pty/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/pty/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/readline/.cvsignore b/ext/readline/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/readline/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/sdbm/.cvsignore b/ext/sdbm/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/sdbm/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/socket/.cvsignore b/ext/socket/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/socket/.cvsignore
@@ -0,0 +1 @@
+Makefile
diff --git a/ext/tk/.cvsignore b/ext/tk/.cvsignore
new file mode 100644
index 0000000000..f3c7a7c5da
--- /dev/null
+++ b/ext/tk/.cvsignore
@@ -0,0 +1 @@
+Makefile