Switched to library

.gitignore

@@ -13,3 +13,4 @@ libtun-test-*
 *.o
 *.obj
 *.lst
+dub.json

dub.json

@@ -6,7 +6,7 @@
 	"description": "TUN adapter for D",
 	"license": "GPLv3",
 	"name": "libtun",
-	"targetType": "executable",
+	"targetType": "library",
 	"preBuildCommands": ["gcc source/libtun/tunctl.c -o tunctl.o -c"],
 	"lflags": ["tunctl.o"]
 }

source/libtun/testing/app.d

@@ -1,3 +1,5 @@
+module libtun.testing.app;
+
 import std.stdio;
 
 import libtun.adapter;