diff --git a/src/tX_mouse.cc b/src/tX_mouse.cc
--- a/src/tX_mouse.cc
+++ b/src/tX_mouse.cc
@@ -50,2 +50,3 @@
 #include <stdlib.h>
+#include <string.h> /* strcmp() */
 
diff --git a/src/tX_mouse.h b/src/tX_mouse.h
--- a/src/tX_mouse.h
+++ b/src/tX_mouse.h
@@ -38,2 +38,3 @@
 #include <gdk/gdkkeysyms.h>
+#include <gtk/gtk.h> /* GtkWidget */
 
diff --git a/src/tX_vttgui.cc b/src/tX_vttgui.cc
--- a/src/tX_vttgui.cc
+++ b/src/tX_vttgui.cc
@@ -61,2 +61,3 @@
 #include <stdio.h>
+#include <string.h> /* strrchr() */
 #include <ctype.h>
diff --git a/src/tX_global.h b/src/tX_global.h
--- a/src/tX_global.h
+++ b/src/tX_global.h
@@ -37,2 +37,3 @@ extern "C" {
 #include <stdio.h>
+#include <string.h> /* strcpy() */
 #include "tX_types.h"