1 files changed, 5 insertions, 0 deletions

diff --git a/src/s/freebsd.h b/src/s/freebsd.h
index b25e0f85d6f..e0bde6f1d24 100644
--- a/src/s/freebsd.h
+++ b/src/s/freebsd.h
@@ -194,3 +194,8 @@
    buffer text.  This overrides REL_ALLOC.  */
 
 #define USE_MMAP_FOR_BUFFERS    1
+
+/* Use sigprocmask(2) and friends instead of sigblock(2); the man page
+   of sigblock says it is obsolete.  */
+
+#define POSIX_SIGNALS           1