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-rw-r--r--posix/regex_internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/posix/regex_internal.h b/posix/regex_internal.h
index 8f11ba7a44..18414a58cc 100644
--- a/posix/regex_internal.h
+++ b/posix/regex_internal.h
@@ -281,6 +281,7 @@ typedef struct
 #endif
   unsigned int constraint : 10;	/* context constraint */
   unsigned int duplicated : 1;
+  unsigned int opt_subexp : 1;
 #ifdef RE_ENABLE_I18N
   /* These 2 bits can be moved into the union if needed (e.g. if running out
      of bits; move opr.c to opr.c.c and move the flags to opr.c.flags).  */