diff --git a/dpf b/dpf
index 03ddba5..7dbd5a7 160000
--- a/dpf
+++ b/dpf
@@ -1 +1 @@
-Subproject commit 03ddba518eebedc08710123e3e3a83b18662da15
+Subproject commit 7dbd5a7afe004df625b9dfea7f4d79cf7479f7f0
diff --git a/examples/nanovg2.cpp b/examples/nanovg2.cpp
index b2f44bb..f676904 100644
--- a/examples/nanovg2.cpp
+++ b/examples/nanovg2.cpp
@@ -25,6 +25,8 @@
 #include "NanoVG.hpp"
 #include "widgets/NanoPerfWidget.hpp"
 
+#include <cmath>
+
 // ------------------------------------------------------
 // use namespace