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-rw-r--r--ext/socket/rubysocket.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 22a61e3777a..601667d59de 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -80,6 +80,9 @@
#endif
#ifdef HAVE_IFADDRS_H
+# ifdef __HAIKU__
+# define _BSD_SOURCE
+# endif
# include <ifaddrs.h>
#endif
#ifdef HAVE_SYS_IOCTL_H