--- include/Makefile.orig	2013-06-17 00:06:14.000000000 +0900
+++ include/Makefile	2013-06-17 00:18:39.000000000 +0900
@@ -45,17 +45,17 @@
 # Makefile for standard definition file
 #
 
-PREFIX=/usr/local/v6eval
-INCLUDEDIR=$(PREFIX)/include/
+PREFIX?=/usr/local
+INCLUDEDIR=$(PREFIX)/v6eval/include/
 
 all:
 
 install:
-	install -d -o bin -g bin -m 755 $(INCLUDEDIR)
-	install -c -o bin -g bin -m 644 std.def       $(INCLUDEDIR)
-	install -c -o bin -g bin -m 644 stdaddr.def   $(INCLUDEDIR)
-	install -c -o bin -g bin -m 644 stdpacket.def $(INCLUDEDIR)
-	install -c -o bin -g bin -m 644 stdconst.def $(INCLUDEDIR)
+	install -d -m 555 $(INCLUDEDIR)
+	${BSD_INSTALL_DATA} std.def       $(INCLUDEDIR)
+	${BSD_INSTALL_DATA} stdaddr.def   $(INCLUDEDIR)
+	${BSD_INSTALL_DATA} stdpacket.def $(INCLUDEDIR)
+	${BSD_INSTALL_DATA} stdconst.def $(INCLUDEDIR)
 
 depend:
 clean: