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-rw-r--r--Libraries/LibC/unistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Libraries/LibC/unistd.h b/Libraries/LibC/unistd.h
index 4a4621fe8e..f7c86390d1 100644
--- a/Libraries/LibC/unistd.h
+++ b/Libraries/LibC/unistd.h
@@ -153,6 +153,7 @@ enum {
#define MS_NOEXEC (1 << 1)
#define MS_NOSUID (1 << 2)
#define MS_BIND (1 << 3)
+#define MS_RDONLY (1 << 4)
/*
* We aren't fully compliant (don't support policies, and don't have a wide