Fix:
tkevent.c:682:3: error: implicit declaration of function 'TkWmProtocolEventProc' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
TkWmProtocolEventProc(winPtr, eventPtr);
^
tkevent.c:1447:5: error: implicit declaration of function 'Tcl_CheckForSignal' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
if (Tcl_CheckForSignal (tk_mainInterp, TCL_OK) == TCL_ERROR)
^
tkevent.c:1512:5: error: implicit declaration of function 'Tcl_CheckForSignal' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
if (Tcl_CheckForSignal (tk_mainInterp, TCL_OK) == TCL_ERROR)
^
#include "tkconfig.h"
#include "tkint.h"
+#include "tclxtend.h"
+#include "tkwm.h"
#include <errno.h>
#include <signal.h>
#include <sys/time.h>