Drop -I. to prevent <strings.h> from including ./strings.h
https://bugs.gentoo.org/874624
--- a/Bucket.c
+++ b/Bucket.c
@@ -1,2 +1,2 @@
-#include <util.h>
+#include "util.h"
 
--- a/Game.c
+++ b/Game.c
@@ -4,2 +4,3 @@
 #include <string.h>
+#include <strings.h>
 #include <time.h>
--- a/Makefile.in
+++ b/Makefile.in
@@ -22,3 +22,3 @@
 
-ALL_CFLAGS =	$(CFLAGS) $(CPPFLAGS) -I$(srcdir)
+ALL_CFLAGS =	$(CFLAGS) $(CPPFLAGS)
 ALL_LDFLAGS =	$(CFLAGS) $(LDFLAGS)
--- a/UI.c
+++ b/UI.c
@@ -3,2 +3,3 @@
 #include <string.h>
+#include <strings.h>
 
--- a/gtk.c
+++ b/gtk.c
@@ -370,3 +370,3 @@
 	gtk_signal_connect_object(GTK_OBJECT(menu_item), "activate",
-				  gtk_ui_popup_dialog, (gpointer) dialog);
+				  GTK_SIGNAL_FUNC(gtk_ui_popup_dialog), (gpointer) dialog);
 	return (menu_item);
@@ -592,3 +592,3 @@
 	CreateDialog(DIALOG_PAUSEGAME, 0, icon, "Continue", NULL);
-	CreateEnterText(DIALOG_WARPLEVEL, warp_apply);
+	CreateEnterText(DIALOG_WARPLEVEL, GTK_SIGNAL_FUNC(warp_apply));
 	CreateDialog(DIALOG_HIGHSCORE, 0, NULL, NULL, NULL);
@@ -602,3 +602,3 @@
 	CreateDialog(DIALOG_ENDGAME, 0, NULL, "Nuts!", NULL);
-	CreateEnterText(DIALOG_ENTERNAME, enter_name);
+	CreateEnterText(DIALOG_ENTERNAME, GTK_SIGNAL_FUNC(enter_name));
 }