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-rw-r--r--invlist_inline.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/invlist_inline.h b/invlist_inline.h
index 48084d3d69..cd002cef19 100644
--- a/invlist_inline.h
+++ b/invlist_inline.h
@@ -6,6 +6,9 @@
* License or the Artistic License, as specified in the README file.
*/
+#ifndef PERL_INVLIST_INLINE_H_
+#define PERL_INVLIST_INLINE_H_
+
#if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_REGEXEC_C) || defined(PERL_IN_TOKE_C)
/* An element is in an inversion list iff its index is even numbered: 0, 2, 4,
@@ -93,3 +96,5 @@ S_invlist_array(SV* const invlist)
# endif
#endif
+
+#endif /* PERL_INVLIST_INLINE_H_ */