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-rw-r--r--src/termios/cfsetospeed.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/termios/cfsetospeed.c b/src/termios/cfsetospeed.c
index 80c790f1..b571f62e 100644
--- a/src/termios/cfsetospeed.c
+++ b/src/termios/cfsetospeed.c
@@ -1,3 +1,4 @@
+#define _BSD_SOURCE
#include <termios.h>
#include <sys/ioctl.h>
#include <errno.h>