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-rw-r--r--lib/libsystem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/libsystem.c b/lib/libsystem.c
index 61ea390d..48c6f06d 100644
--- a/lib/libsystem.c
+++ b/lib/libsystem.c
@@ -13,6 +13,7 @@
    Contributed to the public domain.
 =============================================================================*/
 #define _XOPEN_SOURCE
+#define _BSD_SOURCE  /* Make SIGWINCH defined on OpenBSD */
 
 #include <stdarg.h>
 #include <unistd.h>