diff --git a/lib/functions.in b/lib/functions.in
index 8ab5a6b..e53824f 100644
--- a/lib/functions.in
+++ b/lib/functions.in
@@ -1148,11 +1148,11 @@ init_vars_and_hooks()
 	fi
 
 	if atstage cross; then
-		makeinstopt="$makeopt"' DESTDIR="$root" DEST_DIR="$root"'
-		makeinstopt="$makeinstopt"' INSTROOT="$root" INSTALLROOT="$root" install'
-	else
-		makeinstopt="$makeopt"' install'
+		makeopt="$makeopt"' INSTALL_PREFIX="$root"'
+		makeopt="$makeopt"' DESTDIR="$root" DEST_DIR="$root"'
+		makeopt="$makeopt"' INSTROOT="$root" INSTALLROOT="$root"'
 	fi
+	makeinstopt="$makeopt"' install'
 
 	custmain=""
 	buildloop=1 buildloops=1