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-rw-r--r--src/perl/perl-common.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/perl/perl-common.h b/src/perl/perl-common.h
index 7c3adfd1..9fa85f07 100644
--- a/src/perl/perl-common.h
+++ b/src/perl/perl-common.h
@@ -29,6 +29,7 @@ SV *perl_func_sv_inc(SV *func, const char *package);
/* For compatibility with perl 5.004 and older */
#ifndef HAVE_PL_PERL
# define PL_sv_undef sv_undef
+extern STRLEN PL_na;
#endif
#define iobject_bless(object) \