3 files changed, 4 insertions, 2 deletions
diff --git a/src/progress.c b/src/progress.c
index ed727cae..734dd732 100644
--- a/src/progress.c
+++ b/src/progress.c
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <sys/types.h>
+#include <unistd.h>
 #include <signal.h>
 #include <glade/glade.h>
 #include "zenity.h"
diff --git a/src/tree.c b/src/tree.c
index 436f632f..49c1d782 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -25,6 +25,7 @@
 
 #include <glade/glade.h>
 #include <string.h>
+#include <stdlib.h>
 #include "zenity.h"
 #include "util.h"
 
diff --git a/src/util.c b/src/util.c
index b839d424..a09841e8 100644
--- a/src/util.c
+++ b/src/util.c
@@ -266,7 +266,7 @@ zenity_util_return_exit_code ( ZenityExitCode value )
 #ifdef GDK_WINDOWING_X11
 
 static Window
-transient_get_xterm ()
+transient_get_xterm (void)
 {
   const char *wid_str = g_getenv ("WINDOWID");
   if (wid_str) {
@@ -303,7 +303,7 @@ transient_is_toplevel (Window wid)
  */
 
 static Window
-transient_get_xterm_toplevel ()
+transient_get_xterm_toplevel (void)
 {
   Window xterm = transient_get_xterm ();
   Display *dpy = GDK_DISPLAY ();