FWP Makefile fix

diff --git a/src/fwp b/src/fwp
index 6acde6c38f6a28d06873af7695d41f64c92c028d..ac6ef3bf51c88e03a6173ff907112f257af1481b 160000 (submodule)
--- a/src/fwp
+++ b/src/fwp
@@ -1 +1 @@
-Subproject commit 6acde6c38f6a28d06873af7695d41f64c92c028d
+Subproject commit ac6ef3bf51c88e03a6173ff907112f257af1481b