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-rw-r--r--include/ruby/missing.h4
1 files changed, 0 insertions, 4 deletions
diff --git a/include/ruby/missing.h b/include/ruby/missing.h
index f83f1b695c..7d551248ae 100644
--- a/include/ruby/missing.h
+++ b/include/ruby/missing.h
@@ -84,10 +84,6 @@ RUBY_EXTERN double atanh(double);
RUBY_EXTERN char *crypt(const char *, const char *);
#endif
-#ifndef HAVE_DUP2
-RUBY_EXTERN int dup2(int, int);
-#endif
-
#ifndef HAVE_EACCESS
RUBY_EXTERN int eaccess(const char*, int);
#endif