diff --git a/mk/os-prefix.mk b/mk/os-prefix.mk
index c546a862..af08c99e 100644
--- a/mk/os-prefix.mk
+++ b/mk/os-prefix.mk
@@ -3,4 +3,6 @@
 
 ifeq (${MKPREFIX},yes)
 CPPFLAGS+=	-DPREFIX
+PKG_PREFIX?=	$(PREFIX)/usr
+SED_EXTRA=	-e '/_PATH=.*usr.bin/d'
 endif
diff --git a/mk/os.mk b/mk/os.mk
index 20b43826..bac0388c 100644
--- a/mk/os.mk
+++ b/mk/os.mk
@@ -13,7 +13,7 @@
 _OS_SH=		uname -s | tr '/' '-'
 _OS:= 		$(shell ${_OS_SH})
 OS?= 		${_OS}
-include ${MK}/os-${OS}.mk
 include ${MK}/os-prefix.mk
+include ${MK}/os-${OS}.mk
 
 RC_LIB=		/$(LIBNAME)/rc
diff --git a/mk/sys.mk b/mk/sys.mk
index 76f0b787..948ec1d4 100644
--- a/mk/sys.mk
+++ b/mk/sys.mk
@@ -26,7 +26,7 @@ ifeq (${MKPREFIX},yes)
 UPREFIX= ${PREFIX}/usr
 endif
 endif
-LOCAL_PREFIX=		/usr/local
+LOCAL_PREFIX=		$(UPREFIX)/local
 
 PICFLAG?=		-fPIC