diff --git gdb/common/signals.c gdb/common/signals.c
index d4cf953..019371e 100644
--- gdb/common/signals.c
+++ gdb/common/signals.c
@@ -41,6 +41,12 @@ struct gdbarch;
 # endif
 #endif
 
+#ifdef __FreeBSD__
+# ifndef SIGLIBRT
+#  define SIGLIBRT 33 /* Older versions do not define the constant */
+# endif
+#endif
+
 /* This table must match in order and size the signals in enum
    gdb_signal.  */
 
@@ -332,6 +338,11 @@ gdb_signal_from_host (int hostsig)
     return GDB_SIGNAL_INFO;
 #endif
 
+#if defined (SIGLIBRT)
+  if ( hostsig == SIGLIBRT )
+    return GDB_SIGNAL_FBSD_LIBRT;
+#endif
+
 #if defined (REALTIME_LO)
   if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
     {
@@ -585,6 +596,11 @@ do_gdb_signal_to_host (enum gdb_signal oursig,
       return SIGINFO;
 #endif
 
+#if defined (SIGLIBRT)
+    case GDB_SIGNAL_FBSD_LIBRT:
+      return SIGLIBRT;
+#endif
+
     default:
 #if defined (REALTIME_LO)
       retsig = 0;
diff --git gdb/infrun.c gdb/infrun.c
index 11dcc0e..6ec4d0b 100644
--- gdb/infrun.c
+++ gdb/infrun.c
@@ -7715,6 +7715,8 @@ leave it stopped or free to run as needed."),
   signal_print[GDB_SIGNAL_WINCH] = 0;
   signal_stop[GDB_SIGNAL_PRIO] = 0;
   signal_print[GDB_SIGNAL_PRIO] = 0;
+  signal_stop[GDB_SIGNAL_FBSD_LIBRT] = 0;
+  signal_print[GDB_SIGNAL_FBSD_LIBRT] = 0;
 
   /* These signals are used internally by user-level thread
      implementations.  (See signal(5) on Solaris.)  Like the above
diff --git include/gdb/signals.def include/gdb/signals.def
index 3f49980..857c69d 100644
--- include/gdb/signals.def
+++ include/gdb/signals.def
@@ -197,4 +197,5 @@ SET (GDB_EXC_BREAKPOINT, 150, "EXC_BREAKPOINT", "Breakpoint")
 /* If you are adding a new signal, add it just above this comment.  */
 
 /* Last and unused enum value, for sizing arrays, etc.  */
-SET (GDB_SIGNAL_LAST, 151, NULL, "GDB_SIGNAL_LAST")
+SET (GDB_SIGNAL_FBSD_LIBRT, 151, "SIGLIBRT", "GDB_SIGNAL_FBSD_LIBRT")
+SET (GDB_SIGNAL_LAST, 152, NULL, "GDB_SIGNAL_MAGIC")