diff --git a/nsprpub/config/.cvsignore b/nsprpub/config/.cvsignore
index e6e162a9bcfd..374ac0b8a59d 100644
--- a/nsprpub/config/.cvsignore
+++ b/nsprpub/config/.cvsignore
@@ -2,3 +2,4 @@ nfspwd
 revdepth
 my_config.mk
 my_overrides.mk
+now
diff --git a/nsprpub/lib/ds/.cvsignore b/nsprpub/lib/ds/.cvsignore
new file mode 100644
index 000000000000..765fadda35bb
--- /dev/null
+++ b/nsprpub/lib/ds/.cvsignore
@@ -0,0 +1 @@
+_pl_bld.h
diff --git a/nsprpub/lib/libc/src/.cvsignore b/nsprpub/lib/libc/src/.cvsignore
new file mode 100644
index 000000000000..765fadda35bb
--- /dev/null
+++ b/nsprpub/lib/libc/src/.cvsignore
@@ -0,0 +1 @@
+_pl_bld.h
diff --git a/nsprpub/pr/src/.cvsignore b/nsprpub/pr/src/.cvsignore
new file mode 100644
index 000000000000..d585a7e0cf95
--- /dev/null
+++ b/nsprpub/pr/src/.cvsignore
@@ -0,0 +1 @@
+_pr_bld.h