--- a/lldb/source/Host/freebsd/Host.cpp
+++ b/lldb/source/Host/freebsd/Host.cpp
@@ -20,6 +20,35 @@
 #include <sys/exec.h>
 #include <machine/elf.h>
 
+#include <signal.h>
+#include <sys/kern/param.h>
+#include <machine/reg.h>
+
+#define	PT_LWPINFO	13	/* Info about the LWP that stopped. */
+#define PT_GETNUMLWPS	14	/* get total number of threads */
+#define PT_GETLWPLIST	15	/* get thread list */
+
+/* Argument structure for PT_LWPINFO. */
+struct ptrace_lwpinfo {
+	__lwpid_t	pl_lwpid;	/* LWP described. */
+	int	pl_event;	/* Event that stopped the LWP. */
+#define	PL_EVENT_NONE	0
+#define	PL_EVENT_SIGNAL	1
+	int	pl_flags;	/* LWP flags. */
+#define	PL_FLAG_SA	0x01	/* M:N thread */
+#define	PL_FLAG_BOUND	0x02	/* M:N bound thread */
+#define	PL_FLAG_SCE	0x04	/* syscall enter point */
+#define	PL_FLAG_SCX	0x08	/* syscall leave point */
+#define	PL_FLAG_EXEC	0x10	/* exec(2) succeeded */
+#define	PL_FLAG_SI	0x20	/* siginfo is valid */
+#define	PL_FLAG_FORKED	0x40	/* new child */
+#define	PL_FLAG_CHILD	0x80	/* I am from child */
+	sigset_t	pl_sigmask;	/* LWP signal mask */
+	sigset_t	pl_siglist;	/* LWP pending signal */
+	struct siginfo	pl_siginfo;	/* siginfo for signal */
+	char		pl_tdname[MAXCOMLEN + 1]; /* LWP name */
+	int		pl_child_pid;	/* New child pid */
+};
 
 // C++ Includes
 // Other libraries and framework includes
--- a/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
@@ -18,6 +18,36 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
+#include <signal.h>
+#include <sys/kern/param.h>
+#include <machine/reg.h>
+
+#define	PT_LWPINFO	13	/* Info about the LWP that stopped. */
+#define PT_GETNUMLWPS	14	/* get total number of threads */
+#define PT_GETLWPLIST	15	/* get thread list */
+
+/* Argument structure for PT_LWPINFO. */
+struct ptrace_lwpinfo {
+	__lwpid_t	pl_lwpid;	/* LWP described. */
+	int	pl_event;	/* Event that stopped the LWP. */
+#define	PL_EVENT_NONE	0
+#define	PL_EVENT_SIGNAL	1
+	int	pl_flags;	/* LWP flags. */
+#define	PL_FLAG_SA	0x01	/* M:N thread */
+#define	PL_FLAG_BOUND	0x02	/* M:N bound thread */
+#define	PL_FLAG_SCE	0x04	/* syscall enter point */
+#define	PL_FLAG_SCX	0x08	/* syscall leave point */
+#define	PL_FLAG_EXEC	0x10	/* exec(2) succeeded */
+#define	PL_FLAG_SI	0x20	/* siginfo is valid */
+#define	PL_FLAG_FORKED	0x40	/* new child */
+#define	PL_FLAG_CHILD	0x80	/* I am from child */
+	sigset_t	pl_sigmask;	/* LWP signal mask */
+	sigset_t	pl_siglist;	/* LWP pending signal */
+	struct siginfo	pl_siginfo;	/* siginfo for signal */
+	char		pl_tdname[MAXCOMLEN + 1]; /* LWP name */
+	int		pl_child_pid;	/* New child pid */
+};
+
 // C++ Includes
 // Other libraries and framework includes
 #include "lldb/Core/Error.h"