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-rw-r--r--perlsdio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/perlsdio.h b/perlsdio.h
index fd990c06d8..da45c32714 100644
--- a/perlsdio.h
+++ b/perlsdio.h
@@ -15,6 +15,7 @@
#define PerlIO_stdoutf printf
#define PerlIO_vprintf(f,fmt,a) vfprintf(f,fmt,a)
#define PerlIO_write(f,buf,count) fwrite1(buf,1,count,f)
+#define PerlIO_unread(f,buf,count) (-1)
#define PerlIO_open fopen
#define PerlIO_fdopen fdopen
#define PerlIO_reopen freopen