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>