diff -r 7ba3ae8cf1fc -r 0d857519a4c9 nbproject/project.xml
--- a/nbproject/project.xml	Mon Sep 24 13:59:06 2018 +0200
+++ b/nbproject/project.xml	Mon Sep 24 14:03:46 2018 +0200
@@ -45,7 +45,7 @@
             <name>relpipe-out-chart.qt.cpp</name>
             <c-extensions/>
             <cpp-extensions>cpp</cpp-extensions>
-            <header-extensions/>
+            <header-extensions>h</header-extensions>
             <sourceEncoding>UTF-8</sourceEncoding>
             <sourceRootList>
                 <sourceRootElem>.</sourceRootElem>