diff --git a/lib/trace-cmd/trace-hooks.c b/lib/trace-cmd/trace-hooks.c
index a58b5356..ad474c1f 100644
--- a/lib/trace-cmd/trace-hooks.c
+++ b/lib/trace-cmd/trace-hooks.c
@@ -11,7 +11,7 @@
 #include "trace-cmd-private.h"
 #include "trace-cmd-local.h"
 #include "event-utils.h"
-
+void warning(const char *fmt, ...); 
 struct hook_list *tracecmd_create_event_hook(const char *arg)
 {
 	struct hook_list *hook;
diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index 88ebc618..383a723d 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -34,7 +34,7 @@
 
 /* for debugging read instead of mmap */
 static int force_read = 0;
-
+void warning(const char *fmt, ...); 
 struct page_map {
 	struct list_head	list;
 	off_t			offset;
diff --git a/lib/trace-cmd/trace-msg.c b/lib/trace-cmd/trace-msg.c
index f5c604f1..d87a5870 100644
--- a/lib/trace-cmd/trace-msg.c
+++ b/lib/trace-cmd/trace-msg.c
@@ -42,7 +42,7 @@ typedef __be32 be32;
 #define MSG_MAX_DATA_LEN		(MSG_MAX_LEN - MSG_HDR_LEN)
 
 unsigned int page_size;
-
+void warning(const char *fmt, ...); 
 struct tracecmd_msg_tinit {
 	be32 cpus;
 	be32 page_size;
diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c
index 731f08dd..af3e6fc6 100644
--- a/lib/trace-cmd/trace-output.c
+++ b/lib/trace-cmd/trace-output.c
@@ -29,7 +29,7 @@
 /* We can't depend on the host size for size_t, all must be 64 bit */
 typedef unsigned long long	tsize_t;
 typedef long long		stsize_t;
-
+void warning(const char *fmt, ...); 
 struct tracecmd_option {
 	unsigned short	id;
 	int		size;
diff --git a/lib/trace-cmd/trace-plugin.c b/lib/trace-cmd/trace-plugin.c
index 72cc8ce4..03962846 100644
--- a/lib/trace-cmd/trace-plugin.c
+++ b/lib/trace-cmd/trace-plugin.c
@@ -13,7 +13,7 @@
 #include "trace-cmd-local.h"
 
 #define LOCAL_PLUGIN_DIR ".local/lib/trace-cmd/plugins/"
-
+void warning(const char *fmt, ...); 
 struct trace_plugin_list {
 	struct trace_plugin_list	*next;
 	char				*name;
diff --git a/lib/trace-cmd/trace-recorder.c b/lib/trace-cmd/trace-recorder.c
index 44f245d5..d5fbe314 100644
--- a/lib/trace-cmd/trace-recorder.c
+++ b/lib/trace-cmd/trace-recorder.c
@@ -29,7 +29,7 @@
 #endif
 
 #define POLL_TIMEOUT_MS		1000
-
+void warning(const char *fmt, ...); 
 struct tracecmd_recorder {
 	struct tracefs_cpu *tcpu;
 	int		fd;
diff --git a/lib/trace-cmd/trace-timesync.c b/lib/trace-cmd/trace-timesync.c
index 6ee4e643..ef90acdc 100644
--- a/lib/trace-cmd/trace-timesync.c
+++ b/lib/trace-cmd/trace-timesync.c
@@ -21,7 +21,7 @@
 #include "tracefs.h"
 #include "event-utils.h"
 #include "trace-tsync-local.h"
-
+void warning(const char *fmt, ...); 
 struct tsync_proto {
 	struct tsync_proto *next;
 	char proto_name[TRACECMD_TSYNC_PNAME_LENGTH];
diff --git a/lib/trace-cmd/trace-util.c b/lib/trace-cmd/trace-util.c
index 37caab45..b2eabc82 100644
--- a/lib/trace-cmd/trace-util.c
+++ b/lib/trace-cmd/trace-util.c
@@ -28,7 +28,7 @@
 
 #define LOCAL_PLUGIN_DIR ".trace-cmd/plugins"
 #define PROC_STACK_FILE "/proc/sys/kernel/stack_tracer_enabled"
-
+void warning(const char *fmt, ...); 
 static bool debug;
 static bool notimeout;
 static int log_level = TEP_LOG_WARNING;
diff --git a/tracecmd/trace-agent.c b/tracecmd/trace-agent.c
index b6b44f58..bec27ba2 100644
--- a/tracecmd/trace-agent.c
+++ b/tracecmd/trace-agent.c
@@ -25,7 +25,7 @@
 #define GUEST_NAME	"::GUEST::"
 
 #define dprint(fmt, ...)	tracecmd_debug(fmt, ##__VA_ARGS__)
-
+void warning(const char *fmt, ...); 
 static void make_vsocks(int nr, int *fds, unsigned int *ports)
 {
 	unsigned int port;
diff --git a/tracecmd/trace-hist.c b/tracecmd/trace-hist.c
index 47dcd6f8..b4d3dc54 100644
--- a/tracecmd/trace-hist.c
+++ b/tracecmd/trace-hist.c
@@ -15,7 +15,7 @@
 #include "trace-hash-local.h"
 #include "trace-local.h"
 #include "list.h"
-
+void warning(const char *fmt, ...); 
 static int sched_wakeup_type;
 static int sched_wakeup_new_type;
 static int sched_switch_type;
diff --git a/tracecmd/trace-listen.c b/tracecmd/trace-listen.c
index e11bca03..adf05dae 100644
--- a/tracecmd/trace-listen.c
+++ b/tracecmd/trace-listen.c
@@ -35,7 +35,7 @@
 #define VAR_RUN_DIR		VAR_DIR_Q(VAR_DIR) "/run"
 
 #define LISTEN_PIDFILE		"trace-cmd-net.pid"
-
+void warning(const char *fmt, ...); 
 static char *default_output_dir = ".";
 static char *output_dir;
 static char *default_output_file = "trace";
diff --git a/tracecmd/trace-profile.c b/tracecmd/trace-profile.c
index d12a0e5e..c8998e70 100644
--- a/tracecmd/trace-profile.c
+++ b/tracecmd/trace-profile.c
@@ -32,7 +32,7 @@
 #define stack_from_item(item)	container_of(item, struct stack_data, hash)
 #define group_from_item(item)	container_of(item, struct group_data, hash)
 #define event_data_from_item(item)	container_of(item, struct event_data, hash)
-
+void warning(const char *fmt, ...); 
 static unsigned long long nsecs_per_sec(unsigned long long ts)
 {
 	return ts / NSEC_PER_SEC;
diff --git a/tracecmd/trace-read.c b/tracecmd/trace-read.c
index a5a0e10a..e32afcea 100644
--- a/tracecmd/trace-read.c
+++ b/tracecmd/trace-read.c
@@ -24,7 +24,7 @@
 #include "trace-hash-local.h"
 #include "kbuffer.h"
 #include "list.h"
-
+void warning(const char *fmt, ...); 
 /*
  * tep_func_repeat_format is defined as a weak variable in the
  * libtraceevent library function plugin, to allow applications
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 3c705270..758fbd7e 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -59,7 +59,7 @@
 #define TSC_CLOCK	"x86-tsc"
 
 #define dprint(fmt, ...)	tracecmd_debug(fmt, ##__VA_ARGS__)
-
+void warning(const char *fmt, ...); 
 enum trace_type {
 	TRACE_TYPE_RECORD	= 1,
 	TRACE_TYPE_START	= (1 << 1),
diff --git a/tracecmd/trace-restore.c b/tracecmd/trace-restore.c
index e9ca3225..8748adfd 100644
--- a/tracecmd/trace-restore.c
+++ b/tracecmd/trace-restore.c
@@ -20,7 +20,7 @@
 #include <errno.h>
 
 #include "trace-local.h"
-
+void warning(const char *fmt, ...); 
 static struct tracecmd_output *create_output(const char *file,
 					     const char *tracing_dir, const char *kallsyms)
 {
diff --git a/tracecmd/trace-stack.c b/tracecmd/trace-stack.c
index 80364949..f2d2a03a 100644
--- a/tracecmd/trace-stack.c
+++ b/tracecmd/trace-stack.c
@@ -19,7 +19,7 @@
 #include "trace-local.h"
 
 #define PROC_FILE "/proc/sys/kernel/stack_tracer_enabled"
-
+void warning(const char *fmt, ...); 
 enum stack_type {
 	STACK_START,
 	STACK_STOP,
diff --git a/tracecmd/trace-vm.c b/tracecmd/trace-vm.c
index 960ed5d5..2ecb7d3b 100644
--- a/tracecmd/trace-vm.c
+++ b/tracecmd/trace-vm.c
@@ -14,7 +14,7 @@
 
 #include "trace-local.h"
 #include "trace-msg.h"
-
+void warning(const char *fmt, ...); 
 static struct trace_guest *guests;
 static size_t guests_len;