diff --git a/.gitignore b/.gitignore
index 1c3b884..6178429 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,11 @@
 # .gitignore for illumos checkouts.
 # Note: this does not try to ignore all files in a fully built workspace.
 # Rather, you are expected to "make clobber" before running "git status".
+cscope.files
+cscope.out
+ncscope.out
+cscope.in.out
+cscope.po.out
 .make.state*
 /log
 /packages