diff -r d13b0b5969aa -r 911ec74cce33 nbproject/project.xml
--- a/nbproject/project.xml	Sat Sep 08 19:44:51 2018 +0200
+++ b/nbproject/project.xml	Sun Sep 09 02:00:00 2018 +0200
@@ -6,7 +6,7 @@
             <name>relpipe-out-tabular.cpp</name>
             <c-extensions/>
             <cpp-extensions>cpp</cpp-extensions>
-            <header-extensions/>
+            <header-extensions>h</header-extensions>
             <sourceEncoding>UTF-8</sourceEncoding>
             <make-dep-projects/>
             <sourceRootList/>