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-rw-r--r--include/regex.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/regex.h b/include/regex.h
index 6b0838a9bd97..3bea3df4f3d4 100644
--- a/include/regex.h
+++ b/include/regex.h
@@ -71,6 +71,7 @@ typedef struct {
#define REG_NOSPEC 0020
#define REG_PEND 0040
#define REG_DUMP 0200
+#define REG_POSIX 0400 /* only POSIX-compliant regex (libregex) */
/* regerror() flags */
#define REG_ENOSYS (-1)